Tóm tắt Lý thuyết Toán 7 Chân trời sáng tạo Học kì 2

<p> </p><div class="row vj__list" style="box-sizing: border-box; color: #313131; font-family: "Open Sans", Arial, sans-serif; font-size: 16px; margin: 0px;"><div class="col-md-6" style="box-sizing: border-box; float: left; min-height: 1px; padding-left: 15px; padding-right: 15px; position: relative;"><h3 class="sub-title" style="border: 0px; box-sizing: border-box; color: black; font-family: inherit; font-size: 1.3em; font-weight: 400; left: 0px; line-height: 1.5em; margin: 0px 0.2em 10px 0px; padding: 0px; position: relative; text-shadow: none;"><a href="https://vietjack.com/toan-7-ct/ly-thuyet-chuong-6-cac-dai-luong-ti-le.jsp" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; box-sizing: border-box; color: #111111; outline: 0px !important; text-decoration-line: none; transition: color 0.3s ease-in-out 0s;"><span style="box-sizing: border-box; color: blue; font-weight: 700;">Lý thuyết Chương 6: Các đại lượng tỉ lệ</span></a></h3><ul class="list" style="box-sizing: border-box; margin: 0px 0px 20px; overflow: hidden; padding: 0px;"><li style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; box-sizing: border-box; color: black; line-height: 24px; list-style: none; margin-bottom: 7px; padding: 0px; text-align: left;"><p style="box-sizing: border-box; font-size: 18px; line-height: 24px; margin: 0px; overflow-wrap: break-word; padding: 0px; text-align: justify;"><a href="https://vietjack.com/toan-7-ct/ly-thuyet-bai-1-ti-le-thuc-day-ti-so-bang-nhau.jsp" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: right center; background-repeat: initial; background-size: initial; box-sizing: border-box; color: #313131; display: inline-block; font-size: 16px; outline: 0px !important; padding-bottom: 2px; padding-right: 22px; text-decoration-line: none; transition: color 0.3s ease-in-out 0s;"><span style="box-sizing: border-box; color: green; font-weight: 640;">Lý thuyết Bài 1: Tỉ lệ thức - Dãy tỉ số bằng nhau</span></a></p></li><li style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; box-sizing: border-box; color: black; line-height: 24px; list-style: none; margin-bottom: 7px; padding: 0px; text-align: left;"><p style="box-sizing: border-box; font-size: 18px; line-height: 24px; margin: 0px; overflow-wrap: break-word; padding: 0px; text-align: justify;"><a href="https://vietjack.com/toan-7-ct/ly-thuyet-bai-2-dai-luong-ti-le-thuan.jsp" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: right center; background-repeat: initial; background-size: initial; box-sizing: border-box; color: #313131; display: inline-block; font-size: 16px; outline: 0px !important; padding-bottom: 2px; padding-right: 22px; text-decoration-line: none; transition: color 0.3s ease-in-out 0s;"><span style="box-sizing: border-box; color: green; font-weight: 640;">Lý thuyết Bài 2: Đại lượng tỉ lệ thuận</span></a></p></li><li style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; box-sizing: border-box; color: black; line-height: 24px; list-style: none; margin-bottom: 7px; padding: 0px; text-align: left;"><p style="box-sizing: border-box; font-size: 18px; line-height: 24px; margin: 0px; overflow-wrap: break-word; padding: 0px; text-align: justify;"><a href="https://vietjack.com/toan-7-ct/ly-thuyet-bai-3-dai-luong-ti-le-nghich.jsp" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: right center; background-repeat: initial; background-size: initial; box-sizing: border-box; color: #313131; display: inline-block; font-size: 16px; outline: 0px !important; padding-bottom: 2px; padding-right: 22px; text-decoration-line: none; transition: color 0.3s ease-in-out 0s;"><span style="box-sizing: border-box; color: green; font-weight: 640;">Lý thuyết Bài 3: Đại lượng tỉ lệ nghịch</span></a></p></li><li style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; box-sizing: border-box; color: black; line-height: 24px; list-style: none; margin-bottom: 7px; padding: 0px; text-align: left;"><p style="box-sizing: border-box; font-size: 18px; line-height: 24px; margin: 0px; overflow-wrap: break-word; padding: 0px; text-align: justify;"><a href="https://vietjack.com/toan-7-ct/ly-thuyet-on-tap-chuong-6.jsp" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: right center; background-repeat: initial; background-size: initial; box-sizing: border-box; color: #313131; display: inline-block; font-size: 16px; outline: 0px !important; padding-bottom: 2px; padding-right: 22px; text-decoration-line: none; transition: color 0.3s ease-in-out 0s;"><span style="box-sizing: border-box; color: green; font-weight: 640;">Tổng hợp lý thuyết Toán 7 Chương 6</span></a></p></li></ul></div><div class="col-md-6" style="box-sizing: border-box; float: left; min-height: 1px; padding-left: 15px; padding-right: 15px; position: relative;"><h3 class="sub-title" style="border: 0px; box-sizing: border-box; color: black; font-family: inherit; font-size: 1.3em; font-weight: 400; left: 0px; line-height: 1.5em; margin: 0px 0.2em 10px 0px; padding: 0px; position: relative; text-shadow: none;"><a href="https://vietjack.com/toan-7-ct/ly-thuyet-chuong-7-bieu-thuc-dai-so.jsp" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; box-sizing: border-box; color: #111111; outline: 0px !important; text-decoration-line: none; transition: color 0.3s ease-in-out 0s;"><span style="box-sizing: border-box; color: blue; font-weight: 700;">Lý thuyết Chương 7: Biểu thức đại số</span></a></h3><ul class="list" style="box-sizing: border-box; margin: 0px 0px 20px; overflow: hidden; padding: 0px;"><li style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; box-sizing: border-box; color: black; line-height: 24px; list-style: none; margin-bottom: 7px; padding: 0px; text-align: left;"><p style="box-sizing: border-box; font-size: 18px; line-height: 24px; margin: 0px; overflow-wrap: break-word; padding: 0px; text-align: justify;"><a href="https://vietjack.com/toan-7-ct/ly-thuyet-bai-1-bieu-thuc-so-bieu-thuc-dai-so.jsp" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: right center; background-repeat: initial; background-size: initial; box-sizing: border-box; color: #313131; display: inline-block; font-size: 16px; outline: 0px !important; padding-bottom: 2px; padding-right: 22px; text-decoration-line: none; transition: color 0.3s ease-in-out 0s;"><span style="box-sizing: border-box; color: green; font-weight: 640;">Lý thuyết Bài 1: Biểu thức số, biểu thức đại số</span></a></p></li><li style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; box-sizing: border-box; color: black; line-height: 24px; list-style: none; margin-bottom: 7px; padding: 0px; text-align: left;"><p style="box-sizing: border-box; font-size: 18px; line-height: 24px; margin: 0px; overflow-wrap: break-word; padding: 0px; text-align: justify;"><a href="https://vietjack.com/toan-7-ct/ly-thuyet-bai-2-da-thuc-mot-bien.jsp" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: right center; background-repeat: initial; background-size: initial; box-sizing: border-box; color: #313131; display: inline-block; font-size: 16px; outline: 0px !important; padding-bottom: 2px; padding-right: 22px; text-decoration-line: none; transition: color 0.3s ease-in-out 0s;"><span style="box-sizing: border-box; color: green; font-weight: 640;">Lý thuyết Bài 2: Đa thức một biến</span></a></p></li><li style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; box-sizing: border-box; color: black; line-height: 24px; list-style: none; margin-bottom: 7px; padding: 0px; text-align: left;"><p style="box-sizing: border-box; font-size: 18px; line-height: 24px; margin: 0px; overflow-wrap: break-word; padding: 0px; text-align: justify;"><a href="https://vietjack.com/toan-7-ct/ly-thuyet-bai-3-phep-cong-va-phep-tru-da-thuc-mot-bien.jsp" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: right center; background-repeat: initial; background-size: initial; box-sizing: border-box; color: #313131; display: inline-block; font-size: 16px; outline: 0px !important; padding-bottom: 2px; padding-right: 22px; text-decoration-line: none; transition: color 0.3s ease-in-out 0s;"><span style="box-sizing: border-box; color: green; font-weight: 640;">Lý thuyết Bài 3: Phép cộng và phép trừ đa thức một biến</span></a></p></li><li style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; box-sizing: border-box; color: black; line-height: 24px; list-style: none; margin-bottom: 7px; padding: 0px; text-align: left;"><p style="box-sizing: border-box; font-size: 18px; line-height: 24px; margin: 0px; overflow-wrap: break-word; padding: 0px; text-align: justify;"><a href="https://vietjack.com/toan-7-ct/ly-thuyet-bai-4-phep-nhan-va-phep-chia-da-thuc-mot-bien.jsp" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: right center; background-repeat: initial; background-size: initial; box-sizing: border-box; color: #313131; display: inline-block; font-size: 16px; outline: 0px !important; padding-bottom: 2px; padding-right: 22px; text-decoration-line: none; transition: color 0.3s ease-in-out 0s;"><span style="box-sizing: border-box; color: green; font-weight: 640;">Lý thuyết Bài 4: Phép nhân và phép chia đa thức một biến</span></a></p></li><li style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; box-sizing: border-box; color: black; line-height: 24px; list-style: none; margin-bottom: 7px; padding: 0px; text-align: left;"><p style="box-sizing: border-box; font-size: 18px; line-height: 24px; margin: 0px; overflow-wrap: break-word; padding: 0px; text-align: justify;"><a href="https://vietjack.com/toan-7-ct/ly-thuyet-on-tap-chuong-7.jsp" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: right center; background-repeat: initial; background-size: initial; box-sizing: border-box; color: #313131; display: inline-block; font-size: 16px; outline: 0px !important; padding-bottom: 2px; padding-right: 22px; text-decoration-line: none; transition: color 0.3s ease-in-out 0s;"><span style="box-sizing: border-box; color: green; font-weight: 640;">Tổng hợp lý thuyết Toán 7 Chương 7</span></a></p></li></ul></div></div><div class="row vj__list" style="box-sizing: border-box; color: #313131; font-family: "Open Sans", Arial, sans-serif; font-size: 16px; margin: 0px;"><div class="col-md-6" style="box-sizing: border-box; float: left; min-height: 1px; padding-left: 15px; padding-right: 15px; position: relative;"><h3 class="sub-title" style="border: 0px; box-sizing: border-box; color: black; font-family: inherit; font-size: 1.3em; font-weight: 400; left: 0px; line-height: 1.5em; margin: 0px 0.2em 10px 0px; padding: 0px; position: relative; text-shadow: none;"><a href="https://vietjack.com/toan-7-ct/ly-thuyet-chuong-8-tam-giac.jsp" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; box-sizing: border-box; color: #111111; outline: 0px !important; text-decoration-line: none; transition: color 0.3s ease-in-out 0s;"><span style="box-sizing: border-box; color: blue; font-weight: 700;">Lý thuyết Chương 8: Tam giác</span></a></h3><ul class="list" style="box-sizing: border-box; margin: 0px 0px 20px; overflow: hidden; padding: 0px;"><li style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; box-sizing: border-box; color: black; line-height: 24px; list-style: none; margin-bottom: 7px; padding: 0px; text-align: left;"><p style="box-sizing: border-box; font-size: 18px; line-height: 24px; margin: 0px; overflow-wrap: break-word; padding: 0px; text-align: justify;"><a href="https://vietjack.com/toan-7-ct/ly-thuyet-bai-1-goc-va-canh-cua-mot-tam-giac.jsp" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: right center; background-repeat: initial; background-size: initial; box-sizing: border-box; color: #313131; display: inline-block; font-size: 16px; outline: 0px !important; padding-bottom: 2px; padding-right: 22px; text-decoration-line: none; transition: color 0.3s ease-in-out 0s;"><span style="box-sizing: border-box; color: green; font-weight: 640;">Lý thuyết Bài 1: Góc và cạnh của một tam giác</span></a></p></li><li style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; box-sizing: border-box; color: black; line-height: 24px; list-style: none; margin-bottom: 7px; padding: 0px; text-align: left;"><p style="box-sizing: border-box; font-size: 18px; line-height: 24px; margin: 0px; overflow-wrap: break-word; padding: 0px; text-align: justify;"><a href="https://vietjack.com/toan-7-ct/ly-thuyet-bai-2-tam-giac-bang-nhau.jsp" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: right center; background-repeat: initial; background-size: initial; box-sizing: border-box; color: #313131; display: inline-block; font-size: 16px; outline: 0px !important; padding-bottom: 2px; padding-right: 22px; text-decoration-line: none; transition: color 0.3s ease-in-out 0s;"><span style="box-sizing: border-box; color: green; font-weight: 640;">Lý thuyết Bài 2: Tam giác bằng nhau</span></a></p></li><li style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; box-sizing: border-box; color: black; line-height: 24px; list-style: none; margin-bottom: 7px; padding: 0px; text-align: left;"><p style="box-sizing: border-box; font-size: 18px; line-height: 24px; margin: 0px; overflow-wrap: break-word; padding: 0px; text-align: justify;"><a href="https://vietjack.com/toan-7-ct/ly-thuyet-bai-3-tam-giac-can.jsp" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: right center; background-repeat: initial; background-size: initial; box-sizing: border-box; color: #313131; display: inline-block; font-size: 16px; outline: 0px !important; padding-bottom: 2px; padding-right: 22px; text-decoration-line: none; transition: color 0.3s ease-in-out 0s;"><span style="box-sizing: border-box; color: green; font-weight: 640;">Lý thuyết Bài 3: Tam giác cân</span></a></p></li><li style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; box-sizing: border-box; color: black; line-height: 24px; list-style: none; margin-bottom: 7px; padding: 0px; text-align: left;"><p style="box-sizing: border-box; font-size: 18px; line-height: 24px; margin: 0px; overflow-wrap: break-word; padding: 0px; text-align: justify;"><a href="https://vietjack.com/toan-7-ct/ly-thuyet-bai-4-duong-vuong-goc-va-duong-xien.jsp" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: right center; background-repeat: initial; background-size: initial; box-sizing: border-box; color: #313131; display: inline-block; font-size: 16px; outline: 0px !important; padding-bottom: 2px; padding-right: 22px; text-decoration-line: none; transition: color 0.3s ease-in-out 0s;"><span style="box-sizing: border-box; color: green; font-weight: 640;">Lý thuyết Bài 4: Đường vuông góc và đường xiên</span></a></p></li><li style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; box-sizing: border-box; color: black; line-height: 24px; list-style: none; margin-bottom: 7px; padding: 0px; text-align: left;"><p style="box-sizing: border-box; font-size: 18px; line-height: 24px; margin: 0px; overflow-wrap: break-word; padding: 0px; text-align: justify;"><a href="https://vietjack.com/toan-7-ct/ly-thuyet-bai-5-duong-trung-truc-cua-mot-doan-thang.jsp" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: right center; background-repeat: initial; background-size: initial; box-sizing: border-box; color: #313131; display: inline-block; font-size: 16px; outline: 0px !important; padding-bottom: 2px; padding-right: 22px; text-decoration-line: none; transition: color 0.3s ease-in-out 0s;"><span style="box-sizing: border-box; color: green; font-weight: 640;">Lý thuyết Bài 5: Đường trung trực của một đoạn thẳng</span></a></p></li><li style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; box-sizing: border-box; color: black; line-height: 24px; list-style: none; margin-bottom: 7px; padding: 0px; text-align: left;"><p style="box-sizing: border-box; font-size: 18px; line-height: 24px; margin: 0px; overflow-wrap: break-word; padding: 0px; text-align: justify;"><a href="https://vietjack.com/toan-7-ct/ly-thuyet-bai-6-tinh-chat-ba-duong-trung-truc-cua-tam-giac.jsp" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: right center; background-repeat: initial; background-size: initial; box-sizing: border-box; color: #313131; display: inline-block; font-size: 16px; outline: 0px !important; padding-bottom: 2px; padding-right: 22px; text-decoration-line: none; transition: color 0.3s ease-in-out 0s;"><span style="box-sizing: border-box; color: green; font-weight: 640;">Lý thuyết Bài 6: Tính chất ba đường trung trực của tam giác</span></a></p></li><li style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; box-sizing: border-box; color: black; line-height: 24px; list-style: none; margin-bottom: 7px; padding: 0px; text-align: left;"><p style="box-sizing: border-box; font-size: 18px; line-height: 24px; margin: 0px; overflow-wrap: break-word; padding: 0px; text-align: justify;"><a href="https://vietjack.com/toan-7-ct/ly-thuyet-bai-7-tinh-chat-ba-duong-trung-tuyen-cua-tam-giac.jsp" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: right center; background-repeat: initial; background-size: initial; box-sizing: border-box; color: #313131; display: inline-block; font-size: 16px; outline: 0px !important; padding-bottom: 2px; padding-right: 22px; text-decoration-line: none; transition: color 0.3s ease-in-out 0s;"><span style="box-sizing: border-box; color: green; font-weight: 640;">Lý thuyết Bài 7: Tính chất ba đường trung tuyến của tam giác</span></a></p></li><li style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; box-sizing: border-box; color: black; line-height: 24px; list-style: none; margin-bottom: 7px; padding: 0px; text-align: left;"><p style="box-sizing: border-box; font-size: 18px; line-height: 24px; margin: 0px; overflow-wrap: break-word; padding: 0px; text-align: justify;"><a href="https://vietjack.com/toan-7-ct/ly-thuyet-bai-8-tinh-chat-ba-duong-cao-cua-tam-giac.jsp" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: right center; background-repeat: initial; background-size: initial; box-sizing: border-box; color: #313131; display: inline-block; font-size: 16px; outline: 0px !important; padding-bottom: 2px; padding-right: 22px; text-decoration-line: none; transition: color 0.3s ease-in-out 0s;"><span style="box-sizing: border-box; color: green; font-weight: 640;">Lý thuyết Bài 8: Tính chất ba đường cao của tam giác</span></a></p></li><li style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; box-sizing: border-box; color: black; line-height: 24px; list-style: none; margin-bottom: 7px; padding: 0px; text-align: left;"><p style="box-sizing: border-box; font-size: 18px; line-height: 24px; margin: 0px; overflow-wrap: break-word; padding: 0px; text-align: justify;"><a href="https://vietjack.com/toan-7-ct/ly-thuyet-bai-9-tinh-chat-ba-duong-phan-giac-cua-tam-giac.jsp" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: right center; background-repeat: initial; background-size: initial; box-sizing: border-box; color: #313131; display: inline-block; font-size: 16px; outline: 0px !important; padding-bottom: 2px; padding-right: 22px; text-decoration-line: none; transition: color 0.3s ease-in-out 0s;"><span style="box-sizing: border-box; color: green; font-weight: 640;">Lý thuyết Bài 9: Tính chất ba đường phân giác của tam giác</span></a></p></li><li style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; box-sizing: border-box; color: black; line-height: 24px; list-style: none; margin-bottom: 7px; padding: 0px; text-align: left;"><p style="box-sizing: border-box; font-size: 18px; line-height: 24px; margin: 0px; overflow-wrap: break-word; padding: 0px; text-align: justify;"><a href="https://vietjack.com/toan-7-ct/ly-thuyet-bai-tap-cuoi-chuong-8.jsp" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: right center; background-repeat: initial; background-size: initial; box-sizing: border-box; color: #313131; display: inline-block; font-size: 16px; outline: 0px !important; padding-bottom: 2px; padding-right: 22px; text-decoration-line: none; transition: color 0.3s ease-in-out 0s;"><span style="box-sizing: border-box; color: green; font-weight: 640;">Tổng hợp lý thuyết Toán 7 Chương 8</span></a></p></li></ul></div><div class="col-md-6" style="box-sizing: border-box; float: left; min-height: 1px; padding-left: 15px; padding-right: 15px; position: relative;"><h3 class="sub-title" style="border: 0px; box-sizing: border-box; color: black; font-family: inherit; font-size: 1.3em; font-weight: 400; left: 0px; line-height: 1.5em; margin: 0px 0.2em 10px 0px; padding: 0px; position: relative; text-shadow: none;"><a href="https://vietjack.com/toan-7-ct/ly-thuyet-chuong-9-mot-so-yeu-to-xac-suat.jsp" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; box-sizing: border-box; color: #111111; outline: 0px !important; text-decoration-line: none; transition: color 0.3s ease-in-out 0s;"><span style="box-sizing: border-box; color: blue; font-weight: 700;">Lý thuyết Chương 9: Một số yếu tố xác suất</span></a></h3><ul class="list" style="box-sizing: border-box; margin: 0px 0px 20px; overflow: hidden; padding: 0px;"><li style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; box-sizing: border-box; color: black; line-height: 24px; list-style: none; margin-bottom: 7px; padding: 0px; text-align: left;"><p style="box-sizing: border-box; font-size: 18px; line-height: 24px; margin: 0px; overflow-wrap: break-word; padding: 0px; text-align: justify;"><a href="https://vietjack.com/toan-7-ct/ly-thuyet-bai-1-lam-quen-voi-bien-co-ngau-nhien.jsp" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: right center; background-repeat: initial; background-size: initial; box-sizing: border-box; color: #313131; display: inline-block; font-size: 16px; outline: 0px !important; padding-bottom: 2px; padding-right: 22px; text-decoration-line: none; transition: color 0.3s ease-in-out 0s;"><span style="box-sizing: border-box; color: green; font-weight: 640;">Lý thuyết Bài 1: Làm quen với biến cố ngẫu nhiên</span></a></p></li><li style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; box-sizing: border-box; color: black; line-height: 24px; list-style: none; margin-bottom: 7px; padding: 0px; text-align: left;"><p style="box-sizing: border-box; font-size: 18px; line-height: 24px; margin: 0px; overflow-wrap: break-word; padding: 0px; text-align: justify;"><a href="https://vietjack.com/toan-7-ct/ly-thuyet-bai-2-lam-quen-voi-xac-suat-cua-bien-co-ngau-nhien.jsp" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: right center; background-repeat: initial; background-size: initial; box-sizing: border-box; color: #313131; display: inline-block; font-size: 16px; outline: 0px !important; padding-bottom: 2px; padding-right: 22px; text-decoration-line: none; transition: color 0.3s ease-in-out 0s;"><span style="box-sizing: border-box; color: green; font-weight: 640;">Lý thuyết Bài 2: Làm quen với xác suất của biến cố ngẫu nhiên</span></a></p></li><li style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; box-sizing: border-box; color: black; line-height: 24px; list-style: none; margin-bottom: 7px; padding: 0px; text-align: left;"><p style="box-sizing: border-box; font-size: 18px; line-height: 24px; margin: 0px; overflow-wrap: break-word; padding: 0px; text-align: justify;"><a href="https://vietjack.com/toan-7-ct/ly-thuyet-bai-tap-cuoi-chuong-9.jsp" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: right center; background-repeat: initial; background-size: initial; box-sizing: border-box; color: #313131; display: inline-block; font-size: 16px; outline: 0px !important; padding-bottom: 2px; padding-right: 22px; text-decoration-line: none; transition: color 0.3s ease-in-out 0s;"><span style="box-sizing: border-box; color: green; font-weight: 640;">Tổng hợp lý thuyết Toán 7 Chương 9</span></a></p></li></ul></div></div>

Tóm tắt Lý thuyết Toán 7 Chân trời sáng tạo Học kì 2

  Lý thuyết Chương 6: Các đại lượng tỉ lệ Lý thuyết Bài 1: Tỉ lệ thức - Dãy tỉ số bằng nhau Lý thuyết Bài 2: Đại lượng tỉ lệ thuận Lý thuyết...

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Tổng hợp công thức Toán 7 Học kì 1

<h3 class="sub-title" style="border: 0px; box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 1.3em; font-weight: 400; left: 0px; line-height: 1.5em; margin: 20px 0.2em 10px 0px; padding: 0px; position: relative; text-shadow: none;"><a href="https://vietjack.com/cong-thuc/cong-thuc-toan-lop-7-chuong-1-dai-so.jsp" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; box-sizing: border-box; color: #111111; outline: 0px !important; text-decoration-line: none; transition: color 0.3s ease-in-out 0s;"><span style="box-sizing: border-box; color: blue; font-weight: 700;">Công thức Toán 7 Chương 1 Số hữu tỉ</span></a></h3><ul class="list" style="box-sizing: border-box; color: #313131; font-family: "Open Sans", Arial, sans-serif; font-size: 16px; margin: 0px 0px 20px; overflow: hidden; padding: 0px;"><li style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; box-sizing: border-box; color: black; line-height: 24px; list-style: none; margin-bottom: 7px; padding: 0px; text-align: left;"><p style="box-sizing: border-box; font-size: 18px; line-height: 24px; margin: 0px; overflow-wrap: break-word; padding: 0px; text-align: justify;"><a href="https://vietjack.com/cong-thuc/cac-cong-thuc-cong-tru-nhan-chia-so-huu-ti-sm.jsp" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: right center; background-repeat: initial; background-size: initial; box-sizing: border-box; color: #313131; display: inline-block; font-size: 16px; outline: 0px !important; padding-bottom: 2px; padding-right: 22px; text-decoration-line: none; transition: color 0.3s ease-in-out 0s;"><span style="box-sizing: border-box; color: green; 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background-clip: initial; background-image: initial; background-origin: initial; background-position: right center; background-repeat: initial; background-size: initial; box-sizing: border-box; color: #313131; display: inline-block; font-size: 16px; outline: 0px !important; padding-bottom: 2px; padding-right: 22px; text-decoration-line: none; transition: color 0.3s ease-in-out 0s;"><span style="box-sizing: border-box; color: green; font-weight: 640;">Công thức về tính chất phép cộng, phép trừ các số thực</span></a></p></li><li style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; box-sizing: border-box; color: black; line-height: 24px; list-style: none; margin-bottom: 7px; padding: 0px; text-align: left;"><p style="box-sizing: border-box; font-size: 18px; line-height: 24px; margin: 0px; overflow-wrap: break-word; padding: 0px; text-align: justify;"><a href="https://vietjack.com/cong-thuc/cong-thuc-lien-quan-den-tinh-chat-cua-phep-nhan-cac-so-thuc-sm.jsp" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: right center; background-repeat: initial; background-size: initial; box-sizing: border-box; color: #313131; display: inline-block; font-size: 16px; outline: 0px !important; padding-bottom: 2px; padding-right: 22px; text-decoration-line: none; transition: color 0.3s ease-in-out 0s;"><span style="box-sizing: border-box; color: green; font-weight: 640;">Công thức về tính chất của phép nhân các số thực</span></a></p></li><li style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; box-sizing: border-box; color: black; line-height: 24px; list-style: none; margin-bottom: 7px; padding: 0px; text-align: left;"><p style="box-sizing: border-box; font-size: 18px; line-height: 24px; margin: 0px; overflow-wrap: break-word; padding: 0px; text-align: justify;"><a href="https://vietjack.com/cong-thuc/cong-thuc-lien-quan-luy-thua-cua-so-thuc-voi-so-mu-tu-sm.jsp" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: right center; background-repeat: initial; background-size: initial; box-sizing: border-box; color: #313131; display: inline-block; font-size: 16px; outline: 0px !important; padding-bottom: 2px; padding-right: 22px; text-decoration-line: none; transition: color 0.3s ease-in-out 0s;"><span style="box-sizing: border-box; color: green; font-weight: 640;">Công thức về luỹ thừa của số thực với số mũ tự nhiên</span></a></p></li><li style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; box-sizing: border-box; color: black; line-height: 24px; list-style: none; margin-bottom: 7px; padding: 0px; text-align: left;"><p style="box-sizing: border-box; font-size: 18px; line-height: 24px; margin: 0px; overflow-wrap: break-word; padding: 0px; text-align: justify;"><a href="https://vietjack.com/cong-thuc/cong-thuc-tinh-gia-tri-tuyet-doi-cua-mot-so-thuc-sm.jsp" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: right center; background-repeat: initial; background-size: initial; box-sizing: border-box; color: #313131; display: inline-block; font-size: 16px; outline: 0px !important; padding-bottom: 2px; padding-right: 22px; text-decoration-line: none; transition: color 0.3s ease-in-out 0s;"><span style="box-sizing: border-box; color: green; font-weight: 640;">Công thức tính giá trị tuyệt đối của một số thực</span></a></p></li><li style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; box-sizing: border-box; color: black; line-height: 24px; list-style: none; margin-bottom: 7px; padding: 0px; text-align: left;"><p style="box-sizing: border-box; font-size: 18px; line-height: 24px; margin: 0px; overflow-wrap: break-word; padding: 0px; text-align: justify;"><a href="https://vietjack.com/cong-thuc/cong-thuc-lien-quan-den-ti-le-thuc-sm.jsp" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: right center; background-repeat: initial; background-size: initial; box-sizing: border-box; color: #313131; display: inline-block; font-size: 16px; outline: 0px !important; padding-bottom: 2px; padding-right: 22px; text-decoration-line: none; transition: color 0.3s ease-in-out 0s;"><span style="box-sizing: border-box; color: green; font-weight: 640;">Công thức về tỉ lệ thức</span></a></p></li><li style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; box-sizing: border-box; color: black; line-height: 24px; list-style: none; margin-bottom: 7px; padding: 0px; text-align: left;"><p style="box-sizing: border-box; font-size: 18px; line-height: 24px; margin: 0px; overflow-wrap: break-word; padding: 0px; text-align: justify;"><a href="https://vietjack.com/cong-thuc/cong-thuc-lien-quan-den-tinh-chat-day-ti-so-bang-sm.jsp" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: right center; background-repeat: initial; background-size: initial; box-sizing: border-box; color: #313131; display: inline-block; font-size: 16px; outline: 0px !important; padding-bottom: 2px; padding-right: 22px; text-decoration-line: none; transition: color 0.3s ease-in-out 0s;"><span style="box-sizing: border-box; color: green; font-weight: 640;">Công thức về tính chất dãy tỉ số bằng nhau</span></a></p></li><li style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; box-sizing: border-box; color: black; line-height: 24px; list-style: none; margin-bottom: 7px; padding: 0px; text-align: left;"><p style="box-sizing: border-box; font-size: 18px; line-height: 24px; margin: 0px; overflow-wrap: break-word; padding: 0px; text-align: justify;"><a href="https://vietjack.com/cong-thuc/cong-thuc-lien-quan-den-dai-luong-ti-le-thuan-sm.jsp" style="background-attachment: initial; 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background-clip: initial; background-image: initial; background-origin: initial; background-position: right center; background-repeat: initial; background-size: initial; box-sizing: border-box; color: #313131; display: inline-block; font-size: 16px; outline: 0px !important; padding-bottom: 2px; padding-right: 22px; text-decoration-line: none; transition: color 0.3s ease-in-out 0s;"><span style="box-sizing: border-box; color: green; font-weight: 640;">Công thức về đại lượng tỉ lệ nghịch</span></a></p></li><li style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; box-sizing: border-box; color: black; line-height: 24px; list-style: none; margin-bottom: 7px; padding: 0px; text-align: left;"><p style="box-sizing: border-box; font-size: 18px; line-height: 24px; margin: 0px; overflow-wrap: break-word; padding: 0px; text-align: justify;"><a href="https://vietjack.com/cong-thuc/cong-thuc-lien-quan-den-tang-giam-ti-le-phan-sm.jsp" style="background-attachment: initial; 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background-clip: initial; background-image: initial; background-origin: initial; background-position: right center; background-repeat: initial; background-size: initial; box-sizing: border-box; color: #313131; display: inline-block; font-size: 16px; outline: 0px !important; padding-bottom: 2px; padding-right: 22px; text-decoration-line: none; transition: color 0.3s ease-in-out 0s;"><span style="box-sizing: border-box; color: green; font-weight: 640;">Công thức về hai góc kề nhau, bù nhau và kề bù</span></a></p></li><li style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; box-sizing: border-box; color: black; line-height: 24px; list-style: none; margin-bottom: 7px; padding: 0px; text-align: left;"><p style="box-sizing: border-box; font-size: 18px; line-height: 24px; margin: 0px; overflow-wrap: break-word; padding: 0px; text-align: justify;"><a href="https://vietjack.com/cong-thuc/cong-thuc-lien-quan-tinh-chat-hai-goc-doi-dinh-sm.jsp" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: right center; background-repeat: initial; background-size: initial; box-sizing: border-box; color: #313131; display: inline-block; font-size: 16px; outline: 0px !important; padding-bottom: 2px; padding-right: 22px; text-decoration-line: none; transition: color 0.3s ease-in-out 0s;"><span style="box-sizing: border-box; color: green; font-weight: 640;">Công thức về tính chất hai góc đối đỉnh</span></a></p></li><li style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; box-sizing: border-box; color: black; line-height: 24px; list-style: none; margin-bottom: 7px; padding: 0px; text-align: left;"><p style="box-sizing: border-box; font-size: 18px; line-height: 24px; margin: 0px; overflow-wrap: break-word; padding: 0px; text-align: justify;"><a href="https://vietjack.com/cong-thuc/cong-thuc-lien-quan-tinh-chat-tia-phan-giac-cua-mot-sm.jsp" style="background-attachment: initial; 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background-clip: initial; background-image: initial; background-origin: initial; background-position: right center; background-repeat: initial; background-size: initial; box-sizing: border-box; color: #313131; display: inline-block; font-size: 16px; outline: 0px !important; padding-bottom: 2px; padding-right: 22px; text-decoration-line: none; transition: color 0.3s ease-in-out 0s;"><span style="box-sizing: border-box; color: green; font-weight: 640;">Công thức tính diện tích, thể tích hình hộp chữ nhật, hình lập phương</span></a></p></li><li style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; box-sizing: border-box; color: black; line-height: 24px; list-style: none; margin-bottom: 7px; padding: 0px; text-align: left;"><p style="box-sizing: border-box; font-size: 18px; line-height: 24px; margin: 0px; overflow-wrap: break-word; padding: 0px; text-align: justify;"><a href="https://vietjack.com/cong-thuc/cong-thuc-tinh-dien-tich-va-the-tich-cua-hinh-lang-sm.jsp" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: right center; background-repeat: initial; background-size: initial; box-sizing: border-box; color: #313131; display: inline-block; font-size: 16px; outline: 0px !important; padding-bottom: 2px; padding-right: 22px; text-decoration-line: none; transition: color 0.3s ease-in-out 0s;"><span style="box-sizing: border-box; color: green; font-weight: 640;">Công thức tính diện tích và thể tích của hình lăng trụ đứng</span></a></p></li></ul><h3 class="sub-title" style="border: 0px; box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 1.3em; font-weight: 400; left: 0px; line-height: 1.5em; margin: 20px 0.2em 10px 0px; padding: 0px; position: relative; text-shadow: none;"><a href="https://vietjack.com/cong-thuc/cong-thuc-toan-lop-7-chuong-3-hinh-hoc.jsp" style="background-attachment: initial; 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background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; box-sizing: border-box; color: black; line-height: 24px; list-style: none; margin-bottom: 7px; padding: 0px; text-align: left;"><p style="box-sizing: border-box; font-size: 18px; line-height: 24px; margin: 0px; overflow-wrap: break-word; padding: 0px; text-align: justify;"><a href="https://vietjack.com/cong-thuc/truong-hop-bang-nhau-thu-nhat-cua-tam-giac-goc-canh-sm.jsp" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: right center; background-repeat: initial; background-size: initial; box-sizing: border-box; color: #313131; display: inline-block; font-size: 16px; outline: 0px !important; padding-bottom: 2px; padding-right: 22px; text-decoration-line: none; transition: color 0.3s ease-in-out 0s;"><span style="box-sizing: border-box; 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padding-bottom: 2px; padding-right: 22px; text-decoration-line: none; transition: color 0.3s ease-in-out 0s;"><span style="box-sizing: border-box; color: green; font-weight: 640;">Công thức Các trường hợp bằng nhau của tam giác vuông</span></a></p></li><li style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: 0px 0px; background-repeat: initial; background-size: initial; box-sizing: border-box; color: black; line-height: 24px; list-style: none; margin-bottom: 7px; padding: 0px; text-align: left;"><p style="box-sizing: border-box; font-size: 18px; line-height: 24px; margin: 0px; overflow-wrap: break-word; padding: 0px; text-align: justify;"><a href="https://vietjack.com/cong-thuc/tam-giac-can-duong-trung-truc-cua-doan-thang-sm.jsp" style="background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: right center; background-repeat: initial; 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Công thức về tính chất hai đường thẳng song song

<p> <span style="color: #00b050; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; font-weight: 700; text-align: justify;">1. Công thức</span></p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;">- Cho ba đường thẳng a, b, c phân biệt tạo thành các góc như hình vẽ.</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;"><img alt="Công thức về tính chất hai đường thẳng song song lớp 7 (hay, chi tiết)" class="fr-fic fr-dii" height="198" src="https://vietjack.com/cong-thuc/images/cong-thuc-lien-quan-tinh-chat-hai-duong-thang-song-song-197852.PNG" style="border: 0px; box-sizing: border-box; display: block; margin-left: auto; margin-right: auto; max-width: 100%; padding-bottom: 4px; vertical-align: middle;" width="249" /></p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;">+) Nếu a // b thì A1^=B1^, A2^=B2^, A3^=B3^, A4^=B4^(các cặp góc đồng vị bằng nhau)</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;">Ngược lại, nếu A1^=B1^(hoặc A2^=B2^, hoặc A3^=B3^, hoặc A4^=B4^) (hai góc đồng vị bằng nhau) thì a // b.</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;">+) Nếu a // b thì A1^=B3^, A2^=B4^(các cặp góc so le trong bằng nhau)</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;">Ngược lại, nếu A1^=B3^(hoặc A2^=B4^) (hai góc so le trong bằng nhau) thì a // b.</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;"><img alt="Công thức về tính chất hai đường thẳng song song lớp 7 (hay, chi tiết)" class="fr-fic fr-dii" height="211" src="https://vietjack.com/cong-thuc/images/cong-thuc-lien-quan-tinh-chat-hai-duong-thang-song-song-197853.PNG" style="border: 0px; box-sizing: border-box; display: block; margin-left: auto; margin-right: auto; max-width: 100%; padding-bottom: 4px; vertical-align: middle;" width="217" /></p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;">c⊥a;c⊥b suy ra a // b.</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;"><span style="box-sizing: border-box; font-weight: 700;"><span style="box-sizing: border-box; color: #00b050;">2. Ví dụ minh hoạ</span></span></p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;"><span style="box-sizing: border-box; font-weight: 700;">Ví dụ 1. </span>Vẽ cặp góc so le trong xAB^, yBA^đều bằng 120°. Hỏi hai đường thẳng Ax và By có song song với nhau không? Vì sao?</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;"><span style="box-sizing: border-box; font-weight: 700;">Hướng dẫn giải:</span></p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;"><img alt="Công thức về tính chất hai đường thẳng song song lớp 7 (hay, chi tiết)" class="fr-fic fr-dii" height="152" src="https://vietjack.com/cong-thuc/images/cong-thuc-lien-quan-tinh-chat-hai-duong-thang-song-song-197854.PNG" style="border: 0px; box-sizing: border-box; display: block; margin-left: auto; margin-right: auto; max-width: 100%; padding-bottom: 4px; vertical-align: middle;" width="347" /></p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;">Ta có: xAB^ = yBA^=120°</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;">Mà hai góc xAB^, yBA^ở vị trí so le trong</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;">Do đó Ax // By (dấu hiệu nhận biết hai đường thẳng song song).</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;"><span style="box-sizing: border-box; font-weight: 700;">Ví dụ 2. </span>Cho hình vẽ, biết ABC^=xAB^+BCy^. Chứng minh Ax // Cy.</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;"><img alt="Công thức về tính chất hai đường thẳng song song lớp 7 (hay, chi tiết)" class="fr-fic fr-dii" height="151" src="https://vietjack.com/cong-thuc/images/cong-thuc-lien-quan-tinh-chat-hai-duong-thang-song-song-197855.PNG" style="border: 0px; box-sizing: border-box; display: block; margin-left: auto; margin-right: auto; max-width: 100%; padding-bottom: 4px; vertical-align: middle;" width="214" /></p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;"><span style="box-sizing: border-box; font-weight: 700;">Hướng dẫn giải:</span></p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;"><img alt="Công thức về tính chất hai đường thẳng song song lớp 7 (hay, chi tiết)" class="fr-fic fr-dii" height="151" src="https://vietjack.com/cong-thuc/images/cong-thuc-lien-quan-tinh-chat-hai-duong-thang-song-song-197856.PNG" style="border: 0px; box-sizing: border-box; display: block; margin-left: auto; margin-right: auto; max-width: 100%; padding-bottom: 4px; vertical-align: middle;" width="246" /></p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;">Kẻ Bm nằm giữa BA và BC sao cho Bm // Ax.</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;">Khi đó A^=B1^(hai góc so le trong) (1)</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;">Theo giả thiết có ABC^=A^+C^nên ABC^=B1^+C^</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;">Mà ABC^=B1^+B2^nên B2^=C^</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;">Mà hai góc ở vị trí so le trong nên Cy // Bm.</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;">Kéo dài tia AB cắt Cy tại D.</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;">Vì Cy // Bm nên B1^=D1^(hai góc đồng vị)(2)</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;">Từ (1) và (2) suy ra A^=D1^</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;">Mà A^và D1^là hai góc so le trong</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;">Nên Ax // Cy (dấu hiệu nhận biết)</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;">Vậy Ax // Cy.</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;"><span style="box-sizing: border-box; font-weight: 700;"><span style="box-sizing: border-box; color: #00b050;">3. Bài tập tự luyện</span></span></p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;"><span style="box-sizing: border-box; font-weight: 700;">Bài 1. </span>Cho hình vẽ. Tính ABC^; DAB^; CAD^; AED^.</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;"><img alt="Công thức về tính chất hai đường thẳng song song lớp 7 (hay, chi tiết)" class="fr-fic fr-dii" height="194" src="https://vietjack.com/cong-thuc/images/cong-thuc-lien-quan-tinh-chat-hai-duong-thang-song-song-197857.PNG" style="border: 0px; box-sizing: border-box; display: block; margin-left: auto; margin-right: auto; max-width: 100%; padding-bottom: 4px; vertical-align: middle;" width="277" /></p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;"><span style="box-sizing: border-box; font-weight: 700;">Bài 2. </span>Cho đường thẳng c cắt hai đường thẳng a, b tại A và B tạo thành cặp góc trong cùng phía bù nhau.</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;">a) Vì sao hai góc so le trong trong mỗi cặp bằng nhau?</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;">b) Vì sao hai góc đồng vị trong mỗi cặp bằng nhau?</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;"><span style="box-sizing: border-box; font-weight: 700;">Bài 3. </span>Hãy chứng minh trên hình vẽ dưới đây ta có AB // CD.</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;"><img alt="Công thức về tính chất hai đường thẳng song song lớp 7 (hay, chi tiết)" class="fr-fic fr-dii" height="193" src="https://vietjack.com/cong-thuc/images/cong-thuc-lien-quan-tinh-chat-hai-duong-thang-song-song-197858.PNG" style="border: 0px; box-sizing: border-box; display: block; margin-left: auto; margin-right: auto; max-width: 100%; padding-bottom: 4px; vertical-align: middle;" width="296" /></p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;"><span style="box-sizing: border-box; font-weight: 700;">Bài 4. </span>Cho góc vuông xOy^, điểm A thuộc tia Ox. Kẻ tia Az vuông góc với Ox (tia Az nằm trong góc xOy^). Gọi Om là tia phân giác của góc xOy^, An là tia phân giác của góc xAz^. Chứng minh Om // An.</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;"><span style="box-sizing: border-box; font-weight: 700;">Bài 5. </span>Tính các giá trị x, y, z, t trên hình.</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;"><img alt="Công thức về tính chất hai đường thẳng song song lớp 7 (hay, chi tiết)" class="fr-fic fr-dii" height="179" src="https://vietjack.com/cong-thuc/images/cong-thuc-lien-quan-tinh-chat-hai-duong-thang-song-song-197859.PNG" style="border: 0px; box-sizing: border-box; display: block; margin-left: auto; margin-right: auto; max-width: 100%; padding-bottom: 4px; vertical-align: middle;" width="219" /></p>

Công thức về tính chất hai đường thẳng song song

  1. Công thức - Cho ba đường thẳng a, b, c phân biệt tạo thành các góc như hình vẽ. +) Nếu a // b thì A1^=B1^, A2^=B2^, A3^=B3^, A4^=B4^(cá...

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Công thức về tính chất tia phân giác

<p> <span style="color: #00b050; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; font-weight: 700; text-align: justify;">1. Công thức</span></p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;">Tia nằm giữa hai cạnh của một góc và tạo với hai cạnh ấy hai góc bằng nhau được gọi là tia phân giác của góc đó.</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;"><img alt="Công thức về tính chất tia phân giác của một góc lớp 7 (hay, chi tiết)" height="167" src="https://vietjack.com/cong-thuc/images/cong-thuc-lien-quan-tinh-chat-tia-phan-giac-cua-mot-goc-197845.PNG" style="border: 0px; box-sizing: border-box; display: block; margin-left: auto; margin-right: auto; max-width: 100%; padding-bottom: 4px; vertical-align: middle;" width="226" /></p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;">Khi Oz là tia phân giác của góc <span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mtext>xOy</mtext><mo>^</mo></mover></math>" id="MathJax-Element-1-Frame" role="presentation" style="border: 0px; box-sizing: border-box; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-1" style="border-collapse: separate; border-spacing: 0px; box-sizing: border-box; display: inline-block;"><span class="mjx-mrow" id="MJXc-Node-2" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mover" id="MJXc-Node-3" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.334em; padding-bottom: 0.06em;"><span class="mjx-mo" id="MJXc-Node-5" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size4-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size4-R, MJXc-TeX-size4-Rw; padding-bottom: 0.232em; padding-top: 0.645em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block; padding-left: 0.027em;"><span class="mjx-mtext" id="MJXc-Node-4" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.553em; padding-top: 0.416em; white-space: pre;">xOy</span></span></span></span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; box-sizing: border-box; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mtext>xOy</mtext><mo>^</mo></mover></math></span></span>thì <span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mtext>xOz</mtext><mo>^</mo></mover><mo>=</mo><mover><mtext>zOy</mtext><mo>^</mo></mover><mo>=</mo><mfrac><mn>1</mn><mn>2</mn></mfrac><mover><mtext>xOy</mtext><mo>^</mo></mover></math>" id="MathJax-Element-2-Frame" role="presentation" style="border: 0px; box-sizing: border-box; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-6" style="border-collapse: separate; border-spacing: 0px; box-sizing: border-box; display: inline-block;"><span class="mjx-mrow" id="MJXc-Node-7" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mover" id="MJXc-Node-8" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.258em; padding-bottom: 0.06em; padding-left: 0.153em;"><span class="mjx-mo" id="MJXc-Node-10" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size3-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size3-R, MJXc-TeX-size3-Rw; padding-bottom: 0.232em; padding-top: 0.553em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block;"><span class="mjx-mtext" id="MJXc-Node-9" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.37em; padding-top: 0.416em; white-space: pre;">xOz</span></span></span></span></span><span class="mjx-mo MJXc-space3" id="MJXc-Node-11" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.094em; white-space: pre;">=</span></span><span class="mjx-mover MJXc-space3" id="MJXc-Node-12" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.258em; padding-bottom: 0.06em; padding-left: 0.153em;"><span class="mjx-mo" id="MJXc-Node-14" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size3-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size3-R, MJXc-TeX-size3-Rw; padding-bottom: 0.232em; padding-top: 0.553em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block;"><span class="mjx-mtext" id="MJXc-Node-13" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.553em; padding-top: 0.416em; white-space: pre;">zOy</span></span></span></span></span><span class="mjx-mo MJXc-space3" id="MJXc-Node-15" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.094em; white-space: pre;">=</span></span><span class="mjx-mfrac MJXc-space3" id="MJXc-Node-16" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-box MJXc-stacked" style="box-sizing: content-box !important; display: inline-block; height: 0px; padding: 0px 0.12em; position: relative; width: 0.495em;"><span class="mjx-numerator" style="box-sizing: content-box !important; display: block; font-size: 15.3985px; position: absolute; text-align: center; top: -1.276em; width: 0.7em;"><span class="mjx-mn" id="MJXc-Node-17" style="box-sizing: content-box !important; display: inline-block; text-align: left;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.37em; white-space: pre;">1</span></span></span><span class="mjx-denominator" style="bottom: -0.569em; box-sizing: content-box !important; display: block; font-size: 15.3985px; position: absolute; text-align: center; width: 0.7em;"><span class="mjx-mn" id="MJXc-Node-18" style="box-sizing: content-box !important; display: inline-block; text-align: left;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.37em; white-space: pre;">2</span></span></span><span class="mjx-line" style="border-bottom: 1.3px solid; box-sizing: content-box !important; display: block; height: 0px; position: absolute; top: -0.28em; width: 0.495em;"></span></span><span class="mjx-vsize" style="box-sizing: content-box !important; display: inline-block; height: 1.305em; vertical-align: -0.402em; width: 0px;"></span></span><span class="mjx-mover" id="MJXc-Node-19" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.334em; padding-bottom: 0.06em;"><span class="mjx-mo" id="MJXc-Node-21" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size4-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size4-R, MJXc-TeX-size4-Rw; padding-bottom: 0.232em; padding-top: 0.645em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block; padding-left: 0.027em;"><span class="mjx-mtext" id="MJXc-Node-20" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.553em; padding-top: 0.416em; white-space: pre;">xOy</span></span></span></span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; box-sizing: border-box; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mtext>xOz</mtext><mo>^</mo></mover><mo>=</mo><mover><mtext>zOy</mtext><mo>^</mo></mover><mo>=</mo><mfrac><mn>1</mn><mn>2</mn></mfrac><mover><mtext>xOy</mtext><mo>^</mo></mover></math></span></span>.</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;"><span style="box-sizing: border-box; font-weight: 700;"><span style="box-sizing: border-box; color: #00b050;">2. Ví dụ minh hoạ</span></span></p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;"><span style="box-sizing: border-box; font-weight: 700;">Ví dụ 1. </span>Vẽ tia phân giác của các góc sau:</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;"><img alt="Công thức về tính chất tia phân giác của một góc lớp 7 (hay, chi tiết)" height="173" src="https://vietjack.com/cong-thuc/images/cong-thuc-lien-quan-tinh-chat-tia-phan-giac-cua-mot-goc-197846.PNG" style="border: 0px; box-sizing: border-box; display: block; margin-left: auto; margin-right: auto; max-width: 100%; padding-bottom: 4px; vertical-align: middle;" width="491" /></p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;"><span style="box-sizing: border-box; font-weight: 700;">Hướng dẫn giải:</span></p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;">Đo số đo các góc trên và vẽ tia phân giác tương ứng:</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;">+) Gọi Oz là tia phân giác của góc <span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mtext>xOy</mtext><mo>^</mo></mover></math>" id="MathJax-Element-3-Frame" role="presentation" style="border: 0px; box-sizing: border-box; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-22" style="border-collapse: separate; border-spacing: 0px; box-sizing: border-box; display: inline-block;"><span class="mjx-mrow" id="MJXc-Node-23" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mover" id="MJXc-Node-24" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.334em; padding-bottom: 0.06em;"><span class="mjx-mo" id="MJXc-Node-26" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size4-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size4-R, MJXc-TeX-size4-Rw; padding-bottom: 0.232em; padding-top: 0.645em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block; padding-left: 0.027em;"><span class="mjx-mtext" id="MJXc-Node-25" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.553em; padding-top: 0.416em; white-space: pre;">xOy</span></span></span></span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; box-sizing: border-box; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mtext>xOy</mtext><mo>^</mo></mover></math></span></span>thì <span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mtext>xOz</mtext><mo>^</mo></mover><mo>=</mo><mover><mtext>zOy</mtext><mo>^</mo></mover><mo>=</mo><mfrac><mn>1</mn><mn>2</mn></mfrac><mover><mtext>xOy</mtext><mo>^</mo></mover><mo>=</mo><mfrac><mn>1</mn><mn>2</mn></mfrac><mn>.60</mn><mo>&#xB0;</mo><mo>=</mo><mn>30</mn><mo>&#xB0;</mo></math>" id="MathJax-Element-4-Frame" role="presentation" style="border: 0px; box-sizing: border-box; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-27" style="border-collapse: separate; border-spacing: 0px; box-sizing: border-box; display: inline-block;"><span class="mjx-mrow" id="MJXc-Node-28" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mover" id="MJXc-Node-29" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.258em; padding-bottom: 0.06em; padding-left: 0.153em;"><span class="mjx-mo" id="MJXc-Node-31" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size3-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size3-R, MJXc-TeX-size3-Rw; padding-bottom: 0.232em; padding-top: 0.553em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block;"><span class="mjx-mtext" id="MJXc-Node-30" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.37em; padding-top: 0.416em; white-space: pre;">xOz</span></span></span></span></span><span class="mjx-mo MJXc-space3" id="MJXc-Node-32" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.094em; white-space: pre;">=</span></span><span class="mjx-mover MJXc-space3" id="MJXc-Node-33" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.258em; padding-bottom: 0.06em; padding-left: 0.153em;"><span class="mjx-mo" id="MJXc-Node-35" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size3-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size3-R, MJXc-TeX-size3-Rw; padding-bottom: 0.232em; padding-top: 0.553em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block;"><span class="mjx-mtext" id="MJXc-Node-34" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.553em; padding-top: 0.416em; white-space: pre;">zOy</span></span></span></span></span><span class="mjx-mo MJXc-space3" id="MJXc-Node-36" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.094em; white-space: pre;">=</span></span><span class="mjx-mfrac MJXc-space3" id="MJXc-Node-37" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-box MJXc-stacked" style="box-sizing: content-box !important; display: inline-block; height: 0px; padding: 0px 0.12em; position: relative; width: 0.495em;"><span class="mjx-numerator" style="box-sizing: content-box !important; display: block; font-size: 15.3985px; position: absolute; text-align: center; top: -1.276em; width: 0.7em;"><span class="mjx-mn" id="MJXc-Node-38" style="box-sizing: content-box !important; display: inline-block; text-align: left;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.37em; white-space: pre;">1</span></span></span><span class="mjx-denominator" style="bottom: -0.569em; box-sizing: content-box !important; display: block; font-size: 15.3985px; position: absolute; text-align: center; width: 0.7em;"><span class="mjx-mn" id="MJXc-Node-39" style="box-sizing: content-box !important; display: inline-block; text-align: left;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.37em; white-space: pre;">2</span></span></span><span class="mjx-line" style="border-bottom: 1.3px solid; box-sizing: content-box !important; display: block; height: 0px; position: absolute; top: -0.28em; width: 0.495em;"></span></span><span class="mjx-vsize" style="box-sizing: content-box !important; display: inline-block; height: 1.305em; vertical-align: -0.402em; width: 0px;"></span></span><span class="mjx-mover" id="MJXc-Node-40" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.334em; padding-bottom: 0.06em;"><span class="mjx-mo" id="MJXc-Node-42" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size4-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size4-R, MJXc-TeX-size4-Rw; padding-bottom: 0.232em; padding-top: 0.645em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block; padding-left: 0.027em;"><span class="mjx-mtext" id="MJXc-Node-41" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.553em; padding-top: 0.416em; white-space: pre;">xOy</span></span></span></span></span><span class="mjx-mo MJXc-space3" id="MJXc-Node-43" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.094em; white-space: pre;">=</span></span><span class="mjx-mfrac MJXc-space3" id="MJXc-Node-44" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-box MJXc-stacked" style="box-sizing: content-box !important; display: inline-block; height: 0px; padding: 0px 0.12em; position: relative; width: 0.495em;"><span class="mjx-numerator" style="box-sizing: content-box !important; display: block; font-size: 15.3985px; position: absolute; text-align: center; top: -1.276em; width: 0.7em;"><span class="mjx-mn" id="MJXc-Node-45" style="box-sizing: content-box !important; display: inline-block; text-align: left;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.37em; white-space: pre;">1</span></span></span><span class="mjx-denominator" style="bottom: -0.569em; box-sizing: content-box !important; display: block; font-size: 15.3985px; position: absolute; text-align: center; width: 0.7em;"><span class="mjx-mn" id="MJXc-Node-46" style="box-sizing: content-box !important; display: inline-block; text-align: left;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.37em; white-space: pre;">2</span></span></span><span class="mjx-line" style="border-bottom: 1.3px solid; box-sizing: content-box !important; display: block; height: 0px; position: absolute; top: -0.28em; width: 0.495em;"></span></span><span class="mjx-vsize" style="box-sizing: content-box !important; display: inline-block; height: 1.305em; vertical-align: -0.402em; width: 0px;"></span></span><span class="mjx-mn" id="MJXc-Node-47" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.37em; padding-top: 0.37em; white-space: pre;">.60</span></span><span class="mjx-mo" id="MJXc-Node-48" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.416em; white-space: pre;">°</span></span><span class="mjx-mo MJXc-space3" id="MJXc-Node-49" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.094em; white-space: pre;">=</span></span><span class="mjx-mn MJXc-space3" id="MJXc-Node-50" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.37em; padding-top: 0.37em; white-space: pre;">30</span></span><span class="mjx-mo" id="MJXc-Node-51" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.416em; white-space: pre;">°</span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; box-sizing: border-box; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mtext>xOz</mtext><mo>^</mo></mover><mo>=</mo><mover><mtext>zOy</mtext><mo>^</mo></mover><mo>=</mo><mfrac><mn>1</mn><mn>2</mn></mfrac><mover><mtext>xOy</mtext><mo>^</mo></mover><mo>=</mo><mfrac><mn>1</mn><mn>2</mn></mfrac><mn>.60</mn><mo>°</mo><mo>=</mo><mn>30</mn><mo>°</mo></math></span></span>.</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;">Vẽ góc <span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mtext>xOz</mtext><mo>^</mo></mover><mo>=</mo><mn>30</mn><mo>&#xB0;</mo></math>" id="MathJax-Element-5-Frame" role="presentation" style="border: 0px; box-sizing: border-box; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-52" style="border-collapse: separate; border-spacing: 0px; box-sizing: border-box; display: inline-block;"><span class="mjx-mrow" id="MJXc-Node-53" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mover" id="MJXc-Node-54" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.258em; padding-bottom: 0.06em; padding-left: 0.153em;"><span class="mjx-mo" id="MJXc-Node-56" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size3-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size3-R, MJXc-TeX-size3-Rw; padding-bottom: 0.232em; padding-top: 0.553em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block;"><span class="mjx-mtext" id="MJXc-Node-55" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.37em; padding-top: 0.416em; white-space: pre;">xOz</span></span></span></span></span><span class="mjx-mo MJXc-space3" id="MJXc-Node-57" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.094em; white-space: pre;">=</span></span><span class="mjx-mn MJXc-space3" id="MJXc-Node-58" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.37em; padding-top: 0.37em; white-space: pre;">30</span></span><span class="mjx-mo" id="MJXc-Node-59" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.416em; white-space: pre;">°</span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; box-sizing: border-box; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mtext>xOz</mtext><mo>^</mo></mover><mo>=</mo><mn>30</mn><mo>°</mo></math></span></span>ta được Oz là tia phân giác của góc <span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mtext>xOy</mtext><mo>^</mo></mover></math>" id="MathJax-Element-6-Frame" role="presentation" style="border: 0px; box-sizing: border-box; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-60" style="border-collapse: separate; border-spacing: 0px; box-sizing: border-box; display: inline-block;"><span class="mjx-mrow" id="MJXc-Node-61" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mover" id="MJXc-Node-62" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.334em; padding-bottom: 0.06em;"><span class="mjx-mo" id="MJXc-Node-64" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size4-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size4-R, MJXc-TeX-size4-Rw; padding-bottom: 0.232em; padding-top: 0.645em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block; padding-left: 0.027em;"><span class="mjx-mtext" id="MJXc-Node-63" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.553em; padding-top: 0.416em; white-space: pre;">xOy</span></span></span></span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; box-sizing: border-box; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mtext>xOy</mtext><mo>^</mo></mover></math></span></span>.</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;"><img alt="Công thức về tính chất tia phân giác của một góc lớp 7 (hay, chi tiết)" height="205" src="https://vietjack.com/cong-thuc/images/cong-thuc-lien-quan-tinh-chat-tia-phan-giac-cua-mot-goc-197847.PNG" style="border: 0px; box-sizing: border-box; display: block; margin-left: auto; margin-right: auto; max-width: 100%; padding-bottom: 4px; vertical-align: middle;" width="220" /></p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;">+) Gọi At là tia phân giác của góc <span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mtext>mAn</mtext><mo>^</mo></mover></math>" id="MathJax-Element-7-Frame" role="presentation" style="border: 0px; box-sizing: border-box; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-65" style="border-collapse: separate; border-spacing: 0px; box-sizing: border-box; display: inline-block;"><span class="mjx-mrow" id="MJXc-Node-66" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mover" id="MJXc-Node-67" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.334em; padding-bottom: 0.06em; padding-left: 0.125em;"><span class="mjx-mo" id="MJXc-Node-69" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size4-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size4-R, MJXc-TeX-size4-Rw; padding-bottom: 0.232em; padding-top: 0.645em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block;"><span class="mjx-mtext" id="MJXc-Node-68" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.416em; white-space: pre;">mAn</span></span></span></span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; box-sizing: border-box; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mtext>mAn</mtext><mo>^</mo></mover></math></span></span>thì <span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mtext>mAt</mtext><mo>^</mo></mover><mo>=</mo><mover><mtext>tAn</mtext><mo>^</mo></mover><mo>=</mo><mfrac><mtext>1</mtext><mtext>2</mtext></mfrac><mover><mtext>mAn</mtext><mo>^</mo></mover><mo>=</mo><mfrac><mtext>1</mtext><mtext>2</mtext></mfrac><mtext>.120&#xB0;</mtext><mo>=</mo><mtext>60&#xB0;</mtext></math>" id="MathJax-Element-8-Frame" role="presentation" style="border: 0px; box-sizing: border-box; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-70" style="border-collapse: separate; border-spacing: 0px; box-sizing: border-box; display: inline-block;"><span class="mjx-mrow" id="MJXc-Node-71" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mover" id="MJXc-Node-72" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.334em; padding-bottom: 0.06em; padding-left: 0.041em;"><span class="mjx-mo" id="MJXc-Node-74" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size4-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size4-R, MJXc-TeX-size4-Rw; padding-bottom: 0.232em; padding-top: 0.645em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block;"><span class="mjx-mtext" id="MJXc-Node-73" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.37em; padding-top: 0.416em; white-space: pre;">mAt</span></span></span></span></span><span class="mjx-mo MJXc-space3" id="MJXc-Node-75" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.094em; white-space: pre;">=</span></span><span class="mjx-mover MJXc-space3" id="MJXc-Node-76" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.258em; padding-bottom: 0.06em; padding-left: 0.126em;"><span class="mjx-mo" id="MJXc-Node-78" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size3-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size3-R, MJXc-TeX-size3-Rw; padding-bottom: 0.232em; padding-top: 0.553em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block;"><span class="mjx-mtext" id="MJXc-Node-77" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.37em; padding-top: 0.416em; white-space: pre;">tAn</span></span></span></span></span><span class="mjx-mo MJXc-space3" id="MJXc-Node-79" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.094em; white-space: pre;">=</span></span><span class="mjx-mfrac MJXc-space3" id="MJXc-Node-80" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-box MJXc-stacked" style="box-sizing: content-box !important; display: inline-block; height: 0px; padding: 0px 0.12em; position: relative; width: 0.495em;"><span class="mjx-numerator" style="box-sizing: content-box !important; display: block; font-size: 15.3985px; position: absolute; text-align: center; top: -1.276em; width: 0.7em;"><span class="mjx-mtext" id="MJXc-Node-81" style="box-sizing: content-box !important; display: inline-block; text-align: left;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.37em; white-space: pre;">1</span></span></span><span class="mjx-denominator" style="bottom: -0.569em; box-sizing: content-box !important; display: block; font-size: 15.3985px; position: absolute; text-align: center; width: 0.7em;"><span class="mjx-mtext" id="MJXc-Node-82" style="box-sizing: content-box !important; display: inline-block; text-align: left;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.37em; white-space: pre;">2</span></span></span><span class="mjx-line" style="border-bottom: 1.3px solid; box-sizing: content-box !important; display: block; height: 0px; position: absolute; top: -0.28em; width: 0.495em;"></span></span><span class="mjx-vsize" style="box-sizing: content-box !important; display: inline-block; height: 1.305em; vertical-align: -0.402em; width: 0px;"></span></span><span class="mjx-mover" id="MJXc-Node-83" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.334em; padding-bottom: 0.06em; padding-left: 0.125em;"><span class="mjx-mo" id="MJXc-Node-85" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size4-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size4-R, MJXc-TeX-size4-Rw; padding-bottom: 0.232em; padding-top: 0.645em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block;"><span class="mjx-mtext" id="MJXc-Node-84" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.416em; white-space: pre;">mAn</span></span></span></span></span><span class="mjx-mo MJXc-space3" id="MJXc-Node-86" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.094em; white-space: pre;">=</span></span><span class="mjx-mfrac MJXc-space3" id="MJXc-Node-87" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-box MJXc-stacked" style="box-sizing: content-box !important; display: inline-block; height: 0px; padding: 0px 0.12em; position: relative; width: 0.495em;"><span class="mjx-numerator" style="box-sizing: content-box !important; display: block; font-size: 15.3985px; position: absolute; text-align: center; top: -1.276em; width: 0.7em;"><span class="mjx-mtext" id="MJXc-Node-88" style="box-sizing: content-box !important; display: inline-block; text-align: left;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.37em; white-space: pre;">1</span></span></span><span class="mjx-denominator" style="bottom: -0.569em; box-sizing: content-box !important; display: block; font-size: 15.3985px; position: absolute; text-align: center; width: 0.7em;"><span class="mjx-mtext" id="MJXc-Node-89" style="box-sizing: content-box !important; display: inline-block; text-align: left;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.37em; white-space: pre;">2</span></span></span><span class="mjx-line" style="border-bottom: 1.3px solid; box-sizing: content-box !important; display: block; height: 0px; position: absolute; top: -0.28em; width: 0.495em;"></span></span><span class="mjx-vsize" style="box-sizing: content-box !important; display: inline-block; height: 1.305em; vertical-align: -0.402em; width: 0px;"></span></span><span class="mjx-mtext" id="MJXc-Node-90" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.37em; padding-top: 0.416em; white-space: pre;">.120°</span></span><span class="mjx-mo MJXc-space3" id="MJXc-Node-91" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.094em; white-space: pre;">=</span></span><span class="mjx-mtext MJXc-space3" id="MJXc-Node-92" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.37em; padding-top: 0.416em; white-space: pre;">60°</span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; box-sizing: border-box; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mtext>mAt</mtext><mo>^</mo></mover><mo>=</mo><mover><mtext>tAn</mtext><mo>^</mo></mover><mo>=</mo><mfrac><mtext>1</mtext><mtext>2</mtext></mfrac><mover><mtext>mAn</mtext><mo>^</mo></mover><mo>=</mo><mfrac><mtext>1</mtext><mtext>2</mtext></mfrac><mtext>.120°</mtext><mo>=</mo><mtext>60°</mtext></math></span></span>.</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;">Vẽ góc <span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mtext>mAt</mtext><mo>^</mo></mover><mo>=</mo><mn>60</mn><mo>&#xB0;</mo></math>" id="MathJax-Element-9-Frame" role="presentation" style="border: 0px; box-sizing: border-box; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-93" style="border-collapse: separate; border-spacing: 0px; box-sizing: border-box; display: inline-block;"><span class="mjx-mrow" id="MJXc-Node-94" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mover" id="MJXc-Node-95" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.334em; padding-bottom: 0.06em; padding-left: 0.041em;"><span class="mjx-mo" id="MJXc-Node-97" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size4-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size4-R, MJXc-TeX-size4-Rw; padding-bottom: 0.232em; padding-top: 0.645em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block;"><span class="mjx-mtext" id="MJXc-Node-96" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.37em; padding-top: 0.416em; white-space: pre;">mAt</span></span></span></span></span><span class="mjx-mo MJXc-space3" id="MJXc-Node-98" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.094em; white-space: pre;">=</span></span><span class="mjx-mn MJXc-space3" id="MJXc-Node-99" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.37em; padding-top: 0.37em; white-space: pre;">60</span></span><span class="mjx-mo" id="MJXc-Node-100" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.416em; white-space: pre;">°</span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; box-sizing: border-box; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mtext>mAt</mtext><mo>^</mo></mover><mo>=</mo><mn>60</mn><mo>°</mo></math></span></span>ta được At là tia phân giác của góc <span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mtext>mAn</mtext><mo>^</mo></mover></math>" id="MathJax-Element-10-Frame" role="presentation" style="border: 0px; box-sizing: border-box; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-101" style="border-collapse: separate; border-spacing: 0px; box-sizing: border-box; display: inline-block;"><span class="mjx-mrow" id="MJXc-Node-102" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mover" id="MJXc-Node-103" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.334em; padding-bottom: 0.06em; padding-left: 0.125em;"><span class="mjx-mo" id="MJXc-Node-105" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size4-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size4-R, MJXc-TeX-size4-Rw; padding-bottom: 0.232em; padding-top: 0.645em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block;"><span class="mjx-mtext" id="MJXc-Node-104" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.416em; white-space: pre;">mAn</span></span></span></span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; box-sizing: border-box; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mtext>mAn</mtext><mo>^</mo></mover></math></span></span>.</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;"><img alt="Công thức về tính chất tia phân giác của một góc lớp 7 (hay, chi tiết)" height="214" src="https://vietjack.com/cong-thuc/images/cong-thuc-lien-quan-tinh-chat-tia-phan-giac-cua-mot-goc-197848.PNG" style="border: 0px; box-sizing: border-box; display: block; margin-left: auto; margin-right: auto; max-width: 100%; padding-bottom: 4px; vertical-align: middle;" width="348" /></p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;"><span style="box-sizing: border-box; font-weight: 700;">Ví dụ 2. </span>Cho <span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mtext>xOy</mtext><mo>^</mo></mover><mo>=</mo><mn>100</mn><mo>&#xB0;</mo></math>" id="MathJax-Element-11-Frame" role="presentation" style="border: 0px; box-sizing: border-box; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-106" style="border-collapse: separate; border-spacing: 0px; box-sizing: border-box; display: inline-block;"><span class="mjx-mrow" id="MJXc-Node-107" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mover" id="MJXc-Node-108" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.334em; padding-bottom: 0.06em;"><span class="mjx-mo" id="MJXc-Node-110" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size4-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size4-R, MJXc-TeX-size4-Rw; padding-bottom: 0.232em; padding-top: 0.645em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block; padding-left: 0.027em;"><span class="mjx-mtext" id="MJXc-Node-109" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.553em; padding-top: 0.416em; white-space: pre;">xOy</span></span></span></span></span><span class="mjx-mo MJXc-space3" id="MJXc-Node-111" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.094em; white-space: pre;">=</span></span><span class="mjx-mn MJXc-space3" id="MJXc-Node-112" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.37em; padding-top: 0.37em; white-space: pre;">100</span></span><span class="mjx-mo" id="MJXc-Node-113" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.416em; white-space: pre;">°</span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; box-sizing: border-box; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mtext>xOy</mtext><mo>^</mo></mover><mo>=</mo><mn>100</mn><mo>°</mo></math></span></span>. Vẽ tia Oz nằm giữa hai tia Ox và Oy sao cho <span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mtext>xOz</mtext><mo>^</mo></mover><mo>=</mo><mn>50</mn><mo>&#xB0;</mo></math>" id="MathJax-Element-12-Frame" role="presentation" style="border: 0px; box-sizing: border-box; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-114" style="border-collapse: separate; border-spacing: 0px; box-sizing: border-box; display: inline-block;"><span class="mjx-mrow" id="MJXc-Node-115" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mover" id="MJXc-Node-116" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.258em; padding-bottom: 0.06em; padding-left: 0.153em;"><span class="mjx-mo" id="MJXc-Node-118" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size3-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size3-R, MJXc-TeX-size3-Rw; padding-bottom: 0.232em; padding-top: 0.553em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block;"><span class="mjx-mtext" id="MJXc-Node-117" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.37em; padding-top: 0.416em; white-space: pre;">xOz</span></span></span></span></span><span class="mjx-mo MJXc-space3" id="MJXc-Node-119" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.094em; white-space: pre;">=</span></span><span class="mjx-mn MJXc-space3" id="MJXc-Node-120" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.37em; padding-top: 0.37em; white-space: pre;">50</span></span><span class="mjx-mo" id="MJXc-Node-121" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.416em; white-space: pre;">°</span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; box-sizing: border-box; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mtext>xOz</mtext><mo>^</mo></mover><mo>=</mo><mn>50</mn><mo>°</mo></math></span></span>. Chứng tỏ rằng Oz là tia phân giác của <span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mtext>xOy</mtext><mo>^</mo></mover></math>" id="MathJax-Element-13-Frame" role="presentation" style="border: 0px; box-sizing: border-box; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-122" style="border-collapse: separate; border-spacing: 0px; box-sizing: border-box; display: inline-block;"><span class="mjx-mrow" id="MJXc-Node-123" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mover" id="MJXc-Node-124" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.334em; padding-bottom: 0.06em;"><span class="mjx-mo" id="MJXc-Node-126" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size4-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size4-R, MJXc-TeX-size4-Rw; padding-bottom: 0.232em; padding-top: 0.645em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block; padding-left: 0.027em;"><span class="mjx-mtext" id="MJXc-Node-125" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.553em; padding-top: 0.416em; white-space: pre;">xOy</span></span></span></span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; box-sizing: border-box; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mtext>xOy</mtext><mo>^</mo></mover></math></span></span>.</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;"><span style="box-sizing: border-box; font-weight: 700;">Hướng dẫn giải:</span></p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;"><img alt="Công thức về tính chất tia phân giác của một góc lớp 7 (hay, chi tiết)" height="213" src="https://vietjack.com/cong-thuc/images/cong-thuc-lien-quan-tinh-chat-tia-phan-giac-cua-mot-goc-197849.PNG" style="border: 0px; box-sizing: border-box; display: block; margin-left: auto; margin-right: auto; max-width: 100%; padding-bottom: 4px; vertical-align: middle;" width="243" /></p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;">Vì tia Oz nằm giữa hai tia Ox và Oy nên</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;"><span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mrow><mi>x</mi><mi>O</mi><mi>z</mi></mrow><mo>^</mo></mover><mo>+</mo><mover><mrow><mi>z</mi><mtext>O</mtext><mi>y</mi></mrow><mo>^</mo></mover><mo>=</mo><mover><mrow><mi>x</mi><mi>O</mi><mi>y</mi></mrow><mo>^</mo></mover></math>" id="MathJax-Element-14-Frame" role="presentation" style="border: 0px; box-sizing: border-box; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-127" style="border-collapse: separate; border-spacing: 0px; box-sizing: border-box; display: inline-block;"><span class="mjx-mrow" id="MJXc-Node-128" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mover" id="MJXc-Node-129" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.334em; padding-bottom: 0.06em;"><span class="mjx-mo" id="MJXc-Node-134" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size4-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size4-R, MJXc-TeX-size4-Rw; padding-bottom: 0.232em; padding-top: 0.645em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block; padding-left: 0.043em;"><span class="mjx-mrow" id="MJXc-Node-130" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mi" id="MJXc-Node-131" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-top: 0.232em; white-space: pre;">x</span></span><span class="mjx-mi" id="MJXc-Node-132" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-top: 0.461em; white-space: pre;">O</span></span><span class="mjx-mi" id="MJXc-Node-133" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-right: 0.003em; padding-top: 0.232em; white-space: pre;">z</span></span></span></span></span></span><span class="mjx-mo MJXc-space2" id="MJXc-Node-135" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.222em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.416em; padding-top: 0.278em; white-space: pre;">+</span></span><span class="mjx-mover MJXc-space2" id="MJXc-Node-136" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.222em;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.258em; padding-bottom: 0.06em; padding-left: 0.149em;"><span class="mjx-mo" id="MJXc-Node-141" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size3-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size3-R, MJXc-TeX-size3-Rw; padding-bottom: 0.232em; padding-top: 0.553em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block;"><span class="mjx-mrow" id="MJXc-Node-137" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mi" id="MJXc-Node-138" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-right: 0.003em; padding-top: 0.232em; white-space: pre;">z</span></span><span class="mjx-mtext" id="MJXc-Node-139" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.37em; padding-top: 0.416em; white-space: pre;">O</span></span><span class="mjx-mi" id="MJXc-Node-140" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.461em; padding-right: 0.006em; padding-top: 0.232em; white-space: pre;">y</span></span></span></span></span></span><span class="mjx-mo MJXc-space3" id="MJXc-Node-142" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.094em; white-space: pre;">=</span></span><span class="mjx-mover MJXc-space3" id="MJXc-Node-143" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.334em; padding-bottom: 0.06em;"><span class="mjx-mo" id="MJXc-Node-148" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size4-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size4-R, MJXc-TeX-size4-Rw; padding-bottom: 0.232em; padding-top: 0.645em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block; padding-left: 0.029em;"><span class="mjx-mrow" id="MJXc-Node-144" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mi" id="MJXc-Node-145" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-top: 0.232em; white-space: pre;">x</span></span><span class="mjx-mi" id="MJXc-Node-146" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-top: 0.461em; white-space: pre;">O</span></span><span class="mjx-mi" id="MJXc-Node-147" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.461em; padding-right: 0.006em; padding-top: 0.232em; white-space: pre;">y</span></span></span></span></span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; box-sizing: border-box; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mrow><mi>�</mi><mi>�</mi><mi>�</mi></mrow><mo>^</mo></mover><mo>+</mo><mover><mrow><mi>�</mi><mtext>O</mtext><mi>�</mi></mrow><mo>^</mo></mover><mo>=</mo><mover><mrow><mi>�</mi><mi>�</mi><mi>�</mi></mrow><mo>^</mo></mover></math></span></span><br style="box-sizing: border-box;" /></p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;">Hay <span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mn>50</mn><mo>&#xB0;</mo><mo>+</mo><mover><mrow><mi>z</mi><mtext>O</mtext><mi>y</mi></mrow><mo>^</mo></mover><mo>=</mo><mn>100</mn><mo>&#xB0;</mo></math>" id="MathJax-Element-15-Frame" role="presentation" style="border: 0px; box-sizing: border-box; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-149" style="border-collapse: separate; border-spacing: 0px; box-sizing: border-box; display: inline-block;"><span class="mjx-mrow" id="MJXc-Node-150" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mn" id="MJXc-Node-151" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.37em; padding-top: 0.37em; white-space: pre;">50</span></span><span class="mjx-mo" id="MJXc-Node-152" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.416em; white-space: pre;">°</span></span><span class="mjx-mo MJXc-space2" id="MJXc-Node-153" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.222em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.416em; padding-top: 0.278em; white-space: pre;">+</span></span><span class="mjx-mover MJXc-space2" id="MJXc-Node-154" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.222em;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.258em; padding-bottom: 0.06em; padding-left: 0.149em;"><span class="mjx-mo" id="MJXc-Node-159" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size3-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size3-R, MJXc-TeX-size3-Rw; padding-bottom: 0.232em; padding-top: 0.553em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block;"><span class="mjx-mrow" id="MJXc-Node-155" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mi" id="MJXc-Node-156" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-right: 0.003em; padding-top: 0.232em; white-space: pre;">z</span></span><span class="mjx-mtext" id="MJXc-Node-157" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.37em; padding-top: 0.416em; white-space: pre;">O</span></span><span class="mjx-mi" id="MJXc-Node-158" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.461em; padding-right: 0.006em; padding-top: 0.232em; white-space: pre;">y</span></span></span></span></span></span><span class="mjx-mo MJXc-space3" id="MJXc-Node-160" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.094em; white-space: pre;">=</span></span><span class="mjx-mn MJXc-space3" id="MJXc-Node-161" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.37em; padding-top: 0.37em; white-space: pre;">100</span></span><span class="mjx-mo" id="MJXc-Node-162" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.416em; white-space: pre;">°</span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; box-sizing: border-box; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mn>50</mn><mo>°</mo><mo>+</mo><mover><mrow><mi>�</mi><mtext>O</mtext><mi>�</mi></mrow><mo>^</mo></mover><mo>=</mo><mn>100</mn><mo>°</mo></math></span></span></p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;">Suy ra <span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mrow><mi>z</mi><mtext>O</mtext><mi>y</mi></mrow><mo>^</mo></mover><mo>=</mo><mn>100</mn><mo>&#xB0;</mo><mo>&#x2212;</mo><mn>50</mn><mo>&#xB0;</mo><mo>=</mo><mn>50</mn><mo>&#xB0;</mo></math>" id="MathJax-Element-16-Frame" role="presentation" style="border: 0px; box-sizing: border-box; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-163" style="border-collapse: separate; border-spacing: 0px; box-sizing: border-box; display: inline-block;"><span class="mjx-mrow" id="MJXc-Node-164" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mover" id="MJXc-Node-165" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.258em; padding-bottom: 0.06em; padding-left: 0.149em;"><span class="mjx-mo" id="MJXc-Node-170" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size3-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size3-R, MJXc-TeX-size3-Rw; padding-bottom: 0.232em; padding-top: 0.553em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block;"><span class="mjx-mrow" id="MJXc-Node-166" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mi" id="MJXc-Node-167" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-right: 0.003em; padding-top: 0.232em; white-space: pre;">z</span></span><span class="mjx-mtext" id="MJXc-Node-168" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.37em; padding-top: 0.416em; white-space: pre;">O</span></span><span class="mjx-mi" id="MJXc-Node-169" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.461em; padding-right: 0.006em; padding-top: 0.232em; white-space: pre;">y</span></span></span></span></span></span><span class="mjx-mo MJXc-space3" id="MJXc-Node-171" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.094em; white-space: pre;">=</span></span><span class="mjx-mn MJXc-space3" id="MJXc-Node-172" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.37em; padding-top: 0.37em; white-space: pre;">100</span></span><span class="mjx-mo" id="MJXc-Node-173" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.416em; white-space: pre;">°</span></span><span class="mjx-mo MJXc-space2" id="MJXc-Node-174" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.222em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.416em; padding-top: 0.278em; white-space: pre;">−</span></span><span class="mjx-mn MJXc-space2" id="MJXc-Node-175" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.222em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.37em; padding-top: 0.37em; white-space: pre;">50</span></span><span class="mjx-mo" id="MJXc-Node-176" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.416em; white-space: pre;">°</span></span><span class="mjx-mo MJXc-space3" id="MJXc-Node-177" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.094em; white-space: pre;">=</span></span><span class="mjx-mn MJXc-space3" id="MJXc-Node-178" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.37em; padding-top: 0.37em; white-space: pre;">50</span></span><span class="mjx-mo" id="MJXc-Node-179" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.416em; white-space: pre;">°</span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; box-sizing: border-box; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mrow><mi>�</mi><mtext>O</mtext><mi>�</mi></mrow><mo>^</mo></mover><mo>=</mo><mn>100</mn><mo>°</mo><mo>−</mo><mn>50</mn><mo>°</mo><mo>=</mo><mn>50</mn><mo>°</mo></math></span></span></p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;">Tia Oz nằm giữa hai tia Ox và Oy và <span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mrow><mi>x</mi><mi>O</mi><mi>z</mi></mrow><mo>^</mo></mover><mo>=</mo><mover><mrow><mi>z</mi><mtext>O</mtext><mi>y</mi></mrow><mo>^</mo></mover><mo>=</mo><mn>50</mn><mo>&#xB0;</mo></math>" id="MathJax-Element-17-Frame" role="presentation" style="border: 0px; box-sizing: border-box; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-180" style="border-collapse: separate; border-spacing: 0px; box-sizing: border-box; display: inline-block;"><span class="mjx-mrow" id="MJXc-Node-181" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mover" id="MJXc-Node-182" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.334em; padding-bottom: 0.06em;"><span class="mjx-mo" id="MJXc-Node-187" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size4-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size4-R, MJXc-TeX-size4-Rw; padding-bottom: 0.232em; padding-top: 0.645em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block; padding-left: 0.043em;"><span class="mjx-mrow" id="MJXc-Node-183" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mi" id="MJXc-Node-184" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-top: 0.232em; white-space: pre;">x</span></span><span class="mjx-mi" id="MJXc-Node-185" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-top: 0.461em; white-space: pre;">O</span></span><span class="mjx-mi" id="MJXc-Node-186" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-right: 0.003em; padding-top: 0.232em; white-space: pre;">z</span></span></span></span></span></span><span class="mjx-mo MJXc-space3" id="MJXc-Node-188" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.094em; white-space: pre;">=</span></span><span class="mjx-mover MJXc-space3" id="MJXc-Node-189" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.258em; padding-bottom: 0.06em; padding-left: 0.149em;"><span class="mjx-mo" id="MJXc-Node-194" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size3-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size3-R, MJXc-TeX-size3-Rw; padding-bottom: 0.232em; padding-top: 0.553em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block;"><span class="mjx-mrow" id="MJXc-Node-190" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mi" id="MJXc-Node-191" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-right: 0.003em; padding-top: 0.232em; white-space: pre;">z</span></span><span class="mjx-mtext" id="MJXc-Node-192" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.37em; padding-top: 0.416em; white-space: pre;">O</span></span><span class="mjx-mi" id="MJXc-Node-193" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.461em; padding-right: 0.006em; padding-top: 0.232em; white-space: pre;">y</span></span></span></span></span></span><span class="mjx-mo MJXc-space3" id="MJXc-Node-195" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.094em; white-space: pre;">=</span></span><span class="mjx-mn MJXc-space3" id="MJXc-Node-196" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.37em; padding-top: 0.37em; white-space: pre;">50</span></span><span class="mjx-mo" id="MJXc-Node-197" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.416em; white-space: pre;">°</span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; box-sizing: border-box; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mrow><mi>�</mi><mi>�</mi><mi>�</mi></mrow><mo>^</mo></mover><mo>=</mo><mover><mrow><mi>�</mi><mtext>O</mtext><mi>�</mi></mrow><mo>^</mo></mover><mo>=</mo><mn>50</mn><mo>°</mo></math></span></span>nên Oz là tia phân giác của <span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mrow><mi>x</mi><mi>O</mi><mi>y</mi></mrow><mo>^</mo></mover></math>" id="MathJax-Element-18-Frame" role="presentation" style="border: 0px; box-sizing: border-box; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-198" style="border-collapse: separate; border-spacing: 0px; box-sizing: border-box; display: inline-block;"><span class="mjx-mrow" id="MJXc-Node-199" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mover" id="MJXc-Node-200" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.334em; padding-bottom: 0.06em;"><span class="mjx-mo" id="MJXc-Node-205" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size4-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size4-R, MJXc-TeX-size4-Rw; padding-bottom: 0.232em; padding-top: 0.645em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block; padding-left: 0.029em;"><span class="mjx-mrow" id="MJXc-Node-201" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mi" id="MJXc-Node-202" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-top: 0.232em; white-space: pre;">x</span></span><span class="mjx-mi" id="MJXc-Node-203" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-top: 0.461em; white-space: pre;">O</span></span><span class="mjx-mi" id="MJXc-Node-204" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.461em; padding-right: 0.006em; padding-top: 0.232em; white-space: pre;">y</span></span></span></span></span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; box-sizing: border-box; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mrow><mi>�</mi><mi>�</mi><mi>�</mi></mrow><mo>^</mo></mover></math></span></span>.</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;"><span style="box-sizing: border-box; font-weight: 700;"><span style="box-sizing: border-box; color: #00b050;">3. Bài tập tự luyện</span></span></p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;"><span style="box-sizing: border-box; font-weight: 700;">Bài 1. </span>Vẽ tia phân góc của góc <span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mrow><mi>x</mi><mi>O</mi><mi>y</mi></mrow><mo>^</mo></mover></math>" id="MathJax-Element-19-Frame" role="presentation" style="border: 0px; box-sizing: border-box; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-206" style="border-collapse: separate; border-spacing: 0px; box-sizing: border-box; display: inline-block;"><span class="mjx-mrow" id="MJXc-Node-207" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mover" id="MJXc-Node-208" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.334em; padding-bottom: 0.06em;"><span class="mjx-mo" id="MJXc-Node-213" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size4-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size4-R, MJXc-TeX-size4-Rw; padding-bottom: 0.232em; padding-top: 0.645em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block; padding-left: 0.029em;"><span class="mjx-mrow" id="MJXc-Node-209" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mi" id="MJXc-Node-210" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-top: 0.232em; white-space: pre;">x</span></span><span class="mjx-mi" id="MJXc-Node-211" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-top: 0.461em; white-space: pre;">O</span></span><span class="mjx-mi" id="MJXc-Node-212" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.461em; padding-right: 0.006em; padding-top: 0.232em; white-space: pre;">y</span></span></span></span></span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; box-sizing: border-box; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mrow><mi>�</mi><mi>�</mi><mi>�</mi></mrow><mo>^</mo></mover></math></span></span>trong mỗi trường hợp sau:</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;"><img alt="Công thức về tính chất tia phân giác của một góc lớp 7 (hay, chi tiết)" height="174" src="https://vietjack.com/cong-thuc/images/cong-thuc-lien-quan-tinh-chat-tia-phan-giac-cua-mot-goc-197850.PNG" style="border: 0px; box-sizing: border-box; display: block; margin-left: auto; margin-right: auto; max-width: 100%; padding-bottom: 4px; vertical-align: middle;" width="495" /></p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;"><span style="box-sizing: border-box; font-weight: 700;">Bài 2. </span>Trên cùng một nửa mặt phẳng bờ chứa tia Ox, vẽ tia Oy, Ot sao cho <span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mrow><mi>x</mi><mi>O</mi><mi>t</mi></mrow><mo>^</mo></mover><mo>=</mo><mn>40</mn><mo>&#xB0;</mo><mo>;</mo><mover><mrow><mi>x</mi><mi>O</mi><mi>y</mi></mrow><mo>^</mo></mover><mo>=</mo><mn>80</mn><mo>&#xB0;</mo></math>" id="MathJax-Element-20-Frame" role="presentation" style="border: 0px; box-sizing: border-box; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-214" style="border-collapse: separate; border-spacing: 0px; box-sizing: border-box; display: inline-block;"><span class="mjx-mrow" id="MJXc-Node-215" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mover" id="MJXc-Node-216" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.258em; padding-bottom: 0.06em; padding-left: 0.126em;"><span class="mjx-mo" id="MJXc-Node-221" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size3-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size3-R, MJXc-TeX-size3-Rw; padding-bottom: 0.232em; padding-top: 0.553em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block;"><span class="mjx-mrow" id="MJXc-Node-217" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mi" id="MJXc-Node-218" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-top: 0.232em; white-space: pre;">x</span></span><span class="mjx-mi" id="MJXc-Node-219" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-top: 0.461em; white-space: pre;">O</span></span><span class="mjx-mi" id="MJXc-Node-220" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-top: 0.416em; white-space: pre;">t</span></span></span></span></span></span><span class="mjx-mo MJXc-space3" id="MJXc-Node-222" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.094em; white-space: pre;">=</span></span><span class="mjx-mn MJXc-space3" id="MJXc-Node-223" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.37em; padding-top: 0.37em; white-space: pre;">40</span></span><span class="mjx-mo" id="MJXc-Node-224" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.416em; white-space: pre;">°</span></span><span class="mjx-mo" id="MJXc-Node-225" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.553em; padding-top: 0.14em; white-space: pre;">;</span></span><span class="mjx-mover MJXc-space1" id="MJXc-Node-226" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.167em;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.334em; padding-bottom: 0.06em;"><span class="mjx-mo" id="MJXc-Node-231" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size4-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size4-R, MJXc-TeX-size4-Rw; padding-bottom: 0.232em; padding-top: 0.645em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block; padding-left: 0.029em;"><span class="mjx-mrow" id="MJXc-Node-227" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mi" id="MJXc-Node-228" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-top: 0.232em; white-space: pre;">x</span></span><span class="mjx-mi" id="MJXc-Node-229" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-top: 0.461em; white-space: pre;">O</span></span><span class="mjx-mi" id="MJXc-Node-230" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.461em; padding-right: 0.006em; padding-top: 0.232em; white-space: pre;">y</span></span></span></span></span></span><span class="mjx-mo MJXc-space3" id="MJXc-Node-232" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.094em; white-space: pre;">=</span></span><span class="mjx-mn MJXc-space3" id="MJXc-Node-233" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.37em; padding-top: 0.37em; white-space: pre;">80</span></span><span class="mjx-mo" id="MJXc-Node-234" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.416em; white-space: pre;">°</span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; box-sizing: border-box; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mrow><mi>�</mi><mi>�</mi><mi>�</mi></mrow><mo>^</mo></mover><mo>=</mo><mn>40</mn><mo>°</mo><mo>;</mo><mover><mrow><mi>�</mi><mi>�</mi><mi>�</mi></mrow><mo>^</mo></mover><mo>=</mo><mn>80</mn><mo>°</mo></math></span></span>.</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;">a) Tia Ot có nằm giữa hai tia Ox và Oy không?</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;">b) So sánh <span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mrow><mi>t</mi><mi>O</mi><mi>y</mi></mrow><mo>^</mo></mover></math>" id="MathJax-Element-21-Frame" role="presentation" style="border: 0px; box-sizing: border-box; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-235" style="border-collapse: separate; border-spacing: 0px; box-sizing: border-box; display: inline-block;"><span class="mjx-mrow" id="MJXc-Node-236" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mover" id="MJXc-Node-237" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.258em; padding-bottom: 0.06em; padding-left: 0.088em;"><span class="mjx-mo" id="MJXc-Node-242" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size3-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size3-R, MJXc-TeX-size3-Rw; padding-bottom: 0.232em; padding-top: 0.553em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block;"><span class="mjx-mrow" id="MJXc-Node-238" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mi" id="MJXc-Node-239" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-top: 0.416em; white-space: pre;">t</span></span><span class="mjx-mi" id="MJXc-Node-240" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-top: 0.461em; white-space: pre;">O</span></span><span class="mjx-mi" id="MJXc-Node-241" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.461em; padding-right: 0.006em; padding-top: 0.232em; white-space: pre;">y</span></span></span></span></span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; box-sizing: border-box; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mrow><mi>�</mi><mi>�</mi><mi>�</mi></mrow><mo>^</mo></mover></math></span></span>và <span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mrow><mi>x</mi><mi>O</mi><mi>t</mi></mrow><mo>^</mo></mover></math>" id="MathJax-Element-22-Frame" role="presentation" style="border: 0px; box-sizing: border-box; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-243" style="border-collapse: separate; border-spacing: 0px; box-sizing: border-box; display: inline-block;"><span class="mjx-mrow" id="MJXc-Node-244" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mover" id="MJXc-Node-245" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.258em; padding-bottom: 0.06em; padding-left: 0.126em;"><span class="mjx-mo" id="MJXc-Node-250" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size3-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size3-R, MJXc-TeX-size3-Rw; padding-bottom: 0.232em; padding-top: 0.553em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block;"><span class="mjx-mrow" id="MJXc-Node-246" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mi" id="MJXc-Node-247" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-top: 0.232em; white-space: pre;">x</span></span><span class="mjx-mi" id="MJXc-Node-248" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-top: 0.461em; white-space: pre;">O</span></span><span class="mjx-mi" id="MJXc-Node-249" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-top: 0.416em; white-space: pre;">t</span></span></span></span></span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; box-sizing: border-box; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mrow><mi>�</mi><mi>�</mi><mi>�</mi></mrow><mo>^</mo></mover></math></span></span>.</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;">c) Tia Ot có phải là tia phân giác <span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mrow><mi>x</mi><mi>O</mi><mi>y</mi></mrow><mo>^</mo></mover></math>" id="MathJax-Element-23-Frame" role="presentation" style="border: 0px; box-sizing: border-box; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-251" style="border-collapse: separate; border-spacing: 0px; box-sizing: border-box; display: inline-block;"><span class="mjx-mrow" id="MJXc-Node-252" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mover" id="MJXc-Node-253" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.334em; padding-bottom: 0.06em;"><span class="mjx-mo" id="MJXc-Node-258" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size4-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size4-R, MJXc-TeX-size4-Rw; padding-bottom: 0.232em; padding-top: 0.645em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block; padding-left: 0.029em;"><span class="mjx-mrow" id="MJXc-Node-254" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mi" id="MJXc-Node-255" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-top: 0.232em; white-space: pre;">x</span></span><span class="mjx-mi" id="MJXc-Node-256" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-top: 0.461em; white-space: pre;">O</span></span><span class="mjx-mi" id="MJXc-Node-257" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.461em; padding-right: 0.006em; padding-top: 0.232em; white-space: pre;">y</span></span></span></span></span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; box-sizing: border-box; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mrow><mi>�</mi><mi>�</mi><mi>�</mi></mrow><mo>^</mo></mover></math></span></span>không? Vì sao?</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;"><span style="box-sizing: border-box; font-weight: 700;">Bài 3. </span>Cho hai góc <span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mrow><mi>x</mi><mi>O</mi><mi>y</mi></mrow><mo>^</mo></mover></math>" id="MathJax-Element-24-Frame" role="presentation" style="border: 0px; box-sizing: border-box; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-259" style="border-collapse: separate; border-spacing: 0px; box-sizing: border-box; display: inline-block;"><span class="mjx-mrow" id="MJXc-Node-260" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mover" id="MJXc-Node-261" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.334em; padding-bottom: 0.06em;"><span class="mjx-mo" id="MJXc-Node-266" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size4-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size4-R, MJXc-TeX-size4-Rw; padding-bottom: 0.232em; padding-top: 0.645em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block; padding-left: 0.029em;"><span class="mjx-mrow" id="MJXc-Node-262" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mi" id="MJXc-Node-263" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-top: 0.232em; white-space: pre;">x</span></span><span class="mjx-mi" id="MJXc-Node-264" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-top: 0.461em; white-space: pre;">O</span></span><span class="mjx-mi" id="MJXc-Node-265" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.461em; padding-right: 0.006em; padding-top: 0.232em; white-space: pre;">y</span></span></span></span></span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; box-sizing: border-box; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mrow><mi>�</mi><mi>�</mi><mi>�</mi></mrow><mo>^</mo></mover></math></span></span>và <span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mrow><mi>y</mi><mtext>O</mtext><mi>z</mi></mrow><mo>^</mo></mover></math>" id="MathJax-Element-25-Frame" role="presentation" style="border: 0px; box-sizing: border-box; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-267" style="border-collapse: separate; border-spacing: 0px; box-sizing: border-box; display: inline-block;"><span class="mjx-mrow" id="MJXc-Node-268" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mover" id="MJXc-Node-269" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.258em; padding-bottom: 0.06em; padding-left: 0.149em;"><span class="mjx-mo" id="MJXc-Node-274" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size3-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size3-R, MJXc-TeX-size3-Rw; padding-bottom: 0.232em; padding-top: 0.553em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block;"><span class="mjx-mrow" id="MJXc-Node-270" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mi" id="MJXc-Node-271" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.461em; padding-right: 0.006em; padding-top: 0.232em; white-space: pre;">y</span></span><span class="mjx-mtext" id="MJXc-Node-272" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.37em; padding-top: 0.416em; white-space: pre;">O</span></span><span class="mjx-mi" id="MJXc-Node-273" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-right: 0.003em; padding-top: 0.232em; white-space: pre;">z</span></span></span></span></span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; box-sizing: border-box; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mrow><mi>�</mi><mtext>O</mtext><mi>�</mi></mrow><mo>^</mo></mover></math></span></span>là hai góc kề bù, biết <span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mrow><mi>x</mi><mi>O</mi><mi>y</mi></mrow><mo>^</mo></mover><mo>=</mo><mn>120</mn><mo>&#xB0;</mo></math>" id="MathJax-Element-26-Frame" role="presentation" style="border: 0px; box-sizing: border-box; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-275" style="border-collapse: separate; border-spacing: 0px; box-sizing: border-box; display: inline-block;"><span class="mjx-mrow" id="MJXc-Node-276" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mover" id="MJXc-Node-277" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.334em; padding-bottom: 0.06em;"><span class="mjx-mo" id="MJXc-Node-282" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size4-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size4-R, MJXc-TeX-size4-Rw; padding-bottom: 0.232em; padding-top: 0.645em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block; padding-left: 0.029em;"><span class="mjx-mrow" id="MJXc-Node-278" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mi" id="MJXc-Node-279" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-top: 0.232em; white-space: pre;">x</span></span><span class="mjx-mi" id="MJXc-Node-280" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-top: 0.461em; white-space: pre;">O</span></span><span class="mjx-mi" id="MJXc-Node-281" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.461em; padding-right: 0.006em; padding-top: 0.232em; white-space: pre;">y</span></span></span></span></span></span><span class="mjx-mo MJXc-space3" id="MJXc-Node-283" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.094em; white-space: pre;">=</span></span><span class="mjx-mn MJXc-space3" id="MJXc-Node-284" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.37em; padding-top: 0.37em; white-space: pre;">120</span></span><span class="mjx-mo" id="MJXc-Node-285" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.416em; white-space: pre;">°</span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; box-sizing: border-box; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mrow><mi>�</mi><mi>�</mi><mi>�</mi></mrow><mo>^</mo></mover><mo>=</mo><mn>120</mn><mo>°</mo></math></span></span>.</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;">a) Tính <span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mrow><mi>y</mi><mtext>O</mtext><mi>z</mi></mrow><mo>^</mo></mover></math>" id="MathJax-Element-27-Frame" role="presentation" style="border: 0px; box-sizing: border-box; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-286" style="border-collapse: separate; border-spacing: 0px; box-sizing: border-box; display: inline-block;"><span class="mjx-mrow" id="MJXc-Node-287" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mover" id="MJXc-Node-288" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.258em; padding-bottom: 0.06em; padding-left: 0.149em;"><span class="mjx-mo" id="MJXc-Node-293" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size3-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size3-R, MJXc-TeX-size3-Rw; padding-bottom: 0.232em; padding-top: 0.553em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block;"><span class="mjx-mrow" id="MJXc-Node-289" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mi" id="MJXc-Node-290" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.461em; padding-right: 0.006em; padding-top: 0.232em; white-space: pre;">y</span></span><span class="mjx-mtext" id="MJXc-Node-291" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.37em; padding-top: 0.416em; white-space: pre;">O</span></span><span class="mjx-mi" id="MJXc-Node-292" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-right: 0.003em; padding-top: 0.232em; white-space: pre;">z</span></span></span></span></span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; box-sizing: border-box; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mrow><mi>�</mi><mtext>O</mtext><mi>�</mi></mrow><mo>^</mo></mover></math></span></span>.</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;">b) Gọi Om là tia phân giác của <span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mrow><mi>x</mi><mi>O</mi><mi>y</mi></mrow><mo>^</mo></mover></math>" id="MathJax-Element-28-Frame" role="presentation" style="border: 0px; box-sizing: border-box; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-294" style="border-collapse: separate; border-spacing: 0px; box-sizing: border-box; display: inline-block;"><span class="mjx-mrow" id="MJXc-Node-295" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mover" id="MJXc-Node-296" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.334em; padding-bottom: 0.06em;"><span class="mjx-mo" id="MJXc-Node-301" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size4-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size4-R, MJXc-TeX-size4-Rw; padding-bottom: 0.232em; padding-top: 0.645em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block; padding-left: 0.029em;"><span class="mjx-mrow" id="MJXc-Node-297" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mi" id="MJXc-Node-298" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-top: 0.232em; white-space: pre;">x</span></span><span class="mjx-mi" id="MJXc-Node-299" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-top: 0.461em; white-space: pre;">O</span></span><span class="mjx-mi" id="MJXc-Node-300" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.461em; padding-right: 0.006em; padding-top: 0.232em; white-space: pre;">y</span></span></span></span></span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; box-sizing: border-box; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mrow><mi>�</mi><mi>�</mi><mi>�</mi></mrow><mo>^</mo></mover></math></span></span>. Tính <span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mtext>zOm</mtext><mo>^</mo></mover></math>" id="MathJax-Element-29-Frame" role="presentation" style="border: 0px; box-sizing: border-box; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-302" style="border-collapse: separate; border-spacing: 0px; box-sizing: border-box; display: inline-block;"><span class="mjx-mrow" id="MJXc-Node-303" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mover" id="MJXc-Node-304" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.334em; padding-bottom: 0.06em; padding-left: 0.083em;"><span class="mjx-mo" id="MJXc-Node-306" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size4-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size4-R, MJXc-TeX-size4-Rw; padding-bottom: 0.232em; padding-top: 0.645em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block;"><span class="mjx-mtext" id="MJXc-Node-305" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.37em; padding-top: 0.416em; white-space: pre;">zOm</span></span></span></span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; box-sizing: border-box; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mtext>zOm</mtext><mo>^</mo></mover></math></span></span>.</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;"><span style="box-sizing: border-box; font-weight: 700;">Bài 4. </span>Cho hai góc kề bù <span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mrow><mi>A</mi><mi>O</mi><mi>B</mi></mrow><mo>^</mo></mover></math>" id="MathJax-Element-30-Frame" role="presentation" style="border: 0px; box-sizing: border-box; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-307" style="border-collapse: separate; border-spacing: 0px; box-sizing: border-box; display: inline-block;"><span class="mjx-mrow" id="MJXc-Node-308" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mover" id="MJXc-Node-309" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.334em; padding-bottom: 0.06em; padding-left: 0.191em;"><span class="mjx-mo" id="MJXc-Node-314" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size4-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size4-R, MJXc-TeX-size4-Rw; padding-bottom: 0.232em; padding-top: 0.645em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block;"><span class="mjx-mrow" id="MJXc-Node-310" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mi" id="MJXc-Node-311" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-top: 0.507em; white-space: pre;">A</span></span><span class="mjx-mi" id="MJXc-Node-312" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-top: 0.461em; white-space: pre;">O</span></span><span class="mjx-mi" id="MJXc-Node-313" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-top: 0.461em; white-space: pre;">B</span></span></span></span></span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; box-sizing: border-box; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mrow><mi>�</mi><mi>�</mi><mi>�</mi></mrow><mo>^</mo></mover></math></span></span>và <span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mrow><mi>B</mi><mi>O</mi><mi>C</mi></mrow><mo>^</mo></mover></math>" id="MathJax-Element-31-Frame" role="presentation" style="border: 0px; box-sizing: border-box; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-315" style="border-collapse: separate; border-spacing: 0px; box-sizing: border-box; display: inline-block;"><span class="mjx-mrow" id="MJXc-Node-316" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mover" id="MJXc-Node-317" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.334em; padding-bottom: 0.06em; padding-left: 0.197em;"><span class="mjx-mo" id="MJXc-Node-322" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size4-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size4-R, MJXc-TeX-size4-Rw; padding-bottom: 0.232em; padding-top: 0.645em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block;"><span class="mjx-mrow" id="MJXc-Node-318" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mi" id="MJXc-Node-319" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-top: 0.461em; white-space: pre;">B</span></span><span class="mjx-mi" id="MJXc-Node-320" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-top: 0.461em; white-space: pre;">O</span></span><span class="mjx-mi" id="MJXc-Node-321" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-right: 0.045em; padding-top: 0.461em; white-space: pre;">C</span></span></span></span></span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; box-sizing: border-box; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mrow><mi>�</mi><mi>�</mi><mi>�</mi></mrow><mo>^</mo></mover></math></span></span>, trong đó <span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mrow><mi>A</mi><mi>O</mi><mi>B</mi></mrow><mo>^</mo></mover><mo>=</mo><mn>3</mn><mover><mrow><mi>B</mi><mi>O</mi><mi>C</mi></mrow><mo>^</mo></mover></math>" id="MathJax-Element-32-Frame" role="presentation" style="border: 0px; box-sizing: border-box; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-323" style="border-collapse: separate; border-spacing: 0px; box-sizing: border-box; display: inline-block;"><span class="mjx-mrow" id="MJXc-Node-324" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mover" id="MJXc-Node-325" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.334em; padding-bottom: 0.06em; padding-left: 0.191em;"><span class="mjx-mo" id="MJXc-Node-330" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size4-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size4-R, MJXc-TeX-size4-Rw; padding-bottom: 0.232em; padding-top: 0.645em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block;"><span class="mjx-mrow" id="MJXc-Node-326" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mi" id="MJXc-Node-327" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-top: 0.507em; white-space: pre;">A</span></span><span class="mjx-mi" id="MJXc-Node-328" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-top: 0.461em; white-space: pre;">O</span></span><span class="mjx-mi" id="MJXc-Node-329" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-top: 0.461em; white-space: pre;">B</span></span></span></span></span></span><span class="mjx-mo MJXc-space3" id="MJXc-Node-331" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.094em; white-space: pre;">=</span></span><span class="mjx-mn MJXc-space3" id="MJXc-Node-332" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.37em; padding-top: 0.37em; white-space: pre;">3</span></span><span class="mjx-mover" id="MJXc-Node-333" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.334em; padding-bottom: 0.06em; padding-left: 0.197em;"><span class="mjx-mo" id="MJXc-Node-338" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size4-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size4-R, MJXc-TeX-size4-Rw; padding-bottom: 0.232em; padding-top: 0.645em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block;"><span class="mjx-mrow" id="MJXc-Node-334" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mi" id="MJXc-Node-335" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-top: 0.461em; white-space: pre;">B</span></span><span class="mjx-mi" id="MJXc-Node-336" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-top: 0.461em; white-space: pre;">O</span></span><span class="mjx-mi" id="MJXc-Node-337" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-right: 0.045em; padding-top: 0.461em; white-space: pre;">C</span></span></span></span></span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; box-sizing: border-box; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mrow><mi>�</mi><mi>�</mi><mi>�</mi></mrow><mo>^</mo></mover><mo>=</mo><mn>3</mn><mover><mrow><mi>�</mi><mi>�</mi><mi>�</mi></mrow><mo>^</mo></mover></math></span></span>.</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;">a) Tính <span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mrow><mi>B</mi><mi>O</mi><mi>C</mi></mrow><mo>^</mo></mover></math>" id="MathJax-Element-33-Frame" role="presentation" style="border: 0px; box-sizing: border-box; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-339" style="border-collapse: separate; border-spacing: 0px; box-sizing: border-box; display: inline-block;"><span class="mjx-mrow" id="MJXc-Node-340" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mover" id="MJXc-Node-341" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.334em; padding-bottom: 0.06em; padding-left: 0.197em;"><span class="mjx-mo" id="MJXc-Node-346" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size4-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size4-R, MJXc-TeX-size4-Rw; padding-bottom: 0.232em; padding-top: 0.645em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block;"><span class="mjx-mrow" id="MJXc-Node-342" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mi" id="MJXc-Node-343" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-top: 0.461em; white-space: pre;">B</span></span><span class="mjx-mi" id="MJXc-Node-344" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-top: 0.461em; white-space: pre;">O</span></span><span class="mjx-mi" id="MJXc-Node-345" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-right: 0.045em; padding-top: 0.461em; white-space: pre;">C</span></span></span></span></span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; box-sizing: border-box; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mrow><mi>�</mi><mi>�</mi><mi>�</mi></mrow><mo>^</mo></mover></math></span></span>.</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;">b) Trên nửa mặt phẳng bờ AC có chứa tia OB, vẽ tia OD sao cho <span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mtext>AOD</mtext><mo>^</mo></mover><mo>=</mo><mover><mtext>BOC</mtext><mo>^</mo></mover></math>" id="MathJax-Element-34-Frame" role="presentation" style="border: 0px; box-sizing: border-box; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-347" style="border-collapse: separate; border-spacing: 0px; box-sizing: border-box; display: inline-block;"><span class="mjx-mrow" id="MJXc-Node-348" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mover" id="MJXc-Node-349" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.334em; padding-bottom: 0.06em; padding-left: 0.201em;"><span class="mjx-mo" id="MJXc-Node-351" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size4-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size4-R, MJXc-TeX-size4-Rw; padding-bottom: 0.232em; padding-top: 0.645em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block;"><span class="mjx-mtext" id="MJXc-Node-350" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.37em; padding-top: 0.416em; white-space: pre;">AOD</span></span></span></span></span><span class="mjx-mo MJXc-space3" id="MJXc-Node-352" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.094em; white-space: pre;">=</span></span><span class="mjx-mover MJXc-space3" id="MJXc-Node-353" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.334em; padding-bottom: 0.06em; padding-left: 0.16em;"><span class="mjx-mo" id="MJXc-Node-355" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size4-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size4-R, MJXc-TeX-size4-Rw; padding-bottom: 0.232em; padding-top: 0.645em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block;"><span class="mjx-mtext" id="MJXc-Node-354" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.37em; padding-top: 0.416em; white-space: pre;">BOC</span></span></span></span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; box-sizing: border-box; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mtext>AOD</mtext><mo>^</mo></mover><mo>=</mo><mover><mtext>BOC</mtext><mo>^</mo></mover></math></span></span>. Hỏi tia OB có là tia phân giác của góc <span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mtext>COD</mtext><mo>^</mo></mover></math>" id="MathJax-Element-35-Frame" role="presentation" style="border: 0px; box-sizing: border-box; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-356" style="border-collapse: separate; border-spacing: 0px; box-sizing: border-box; display: inline-block;"><span class="mjx-mrow" id="MJXc-Node-357" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mover" id="MJXc-Node-358" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.334em; padding-bottom: 0.06em; padding-left: 0.188em;"><span class="mjx-mo" id="MJXc-Node-360" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size4-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size4-R, MJXc-TeX-size4-Rw; padding-bottom: 0.232em; padding-top: 0.645em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block;"><span class="mjx-mtext" id="MJXc-Node-359" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.37em; padding-top: 0.416em; white-space: pre;">COD</span></span></span></span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; box-sizing: border-box; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mtext>COD</mtext><mo>^</mo></mover></math></span></span>không? Vì sao?</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;"><span style="box-sizing: border-box; font-weight: 700;">Bài 5. </span>Trên cùng một nửa mặt phẳng bờ là đường thẳng xy đi qua O, vẽ các tia Om, On, Ot sao cho <span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mrow><mi>x</mi><mi>O</mi><mi>m</mi></mrow><mo>^</mo></mover><mo>=</mo><mn>55</mn><mo>&#xB0;</mo><mo>;</mo><mover><mrow><mi>y</mi><mtext>O</mtext><mi>n</mi></mrow><mo>^</mo></mover><mo>=</mo><mn>85</mn><mo>&#xB0;</mo><mo>;</mo><mover><mrow><mi>y</mi><mtext>O</mtext><mi>t</mi></mrow><mo>^</mo></mover><mo>=</mo><mn>45</mn><mo>&#xB0;</mo></math>" id="MathJax-Element-36-Frame" role="presentation" style="border: 0px; box-sizing: border-box; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-361" style="border-collapse: separate; border-spacing: 0px; box-sizing: border-box; display: inline-block;"><span class="mjx-mrow" id="MJXc-Node-362" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mover" id="MJXc-Node-363" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.334em; padding-bottom: 0.06em; padding-left: 0.162em;"><span class="mjx-mo" id="MJXc-Node-368" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size4-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size4-R, MJXc-TeX-size4-Rw; padding-bottom: 0.232em; padding-top: 0.645em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block;"><span class="mjx-mrow" id="MJXc-Node-364" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mi" id="MJXc-Node-365" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-top: 0.232em; white-space: pre;">x</span></span><span class="mjx-mi" id="MJXc-Node-366" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-top: 0.461em; white-space: pre;">O</span></span><span class="mjx-mi" id="MJXc-Node-367" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-top: 0.232em; white-space: pre;">m</span></span></span></span></span></span><span class="mjx-mo MJXc-space3" id="MJXc-Node-369" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.094em; white-space: pre;">=</span></span><span class="mjx-mn MJXc-space3" id="MJXc-Node-370" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.37em; padding-top: 0.37em; white-space: pre;">55</span></span><span class="mjx-mo" id="MJXc-Node-371" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.416em; white-space: pre;">°</span></span><span class="mjx-mo" id="MJXc-Node-372" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.553em; padding-top: 0.14em; white-space: pre;">;</span></span><span class="mjx-mover MJXc-space1" id="MJXc-Node-373" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.167em;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.334em; padding-bottom: 0.06em;"><span class="mjx-mo" id="MJXc-Node-378" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size4-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size4-R, MJXc-TeX-size4-Rw; padding-bottom: 0.232em; padding-top: 0.645em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block; padding-left: 0.007em;"><span class="mjx-mrow" id="MJXc-Node-374" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mi" id="MJXc-Node-375" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.461em; padding-right: 0.006em; padding-top: 0.232em; white-space: pre;">y</span></span><span class="mjx-mtext" id="MJXc-Node-376" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.37em; padding-top: 0.416em; white-space: pre;">O</span></span><span class="mjx-mi" id="MJXc-Node-377" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-top: 0.232em; white-space: pre;">n</span></span></span></span></span></span><span class="mjx-mo MJXc-space3" id="MJXc-Node-379" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.094em; white-space: pre;">=</span></span><span class="mjx-mn MJXc-space3" id="MJXc-Node-380" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.37em; padding-top: 0.37em; white-space: pre;">85</span></span><span class="mjx-mo" id="MJXc-Node-381" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.416em; white-space: pre;">°</span></span><span class="mjx-mo" id="MJXc-Node-382" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.553em; padding-top: 0.14em; white-space: pre;">;</span></span><span class="mjx-mover MJXc-space1" id="MJXc-Node-383" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.167em;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.258em; padding-bottom: 0.06em; padding-left: 0.096em;"><span class="mjx-mo" id="MJXc-Node-388" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size3-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size3-R, MJXc-TeX-size3-Rw; padding-bottom: 0.232em; padding-top: 0.553em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block;"><span class="mjx-mrow" id="MJXc-Node-384" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mi" id="MJXc-Node-385" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.461em; padding-right: 0.006em; padding-top: 0.232em; white-space: pre;">y</span></span><span class="mjx-mtext" id="MJXc-Node-386" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.37em; padding-top: 0.416em; white-space: pre;">O</span></span><span class="mjx-mi" id="MJXc-Node-387" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-top: 0.416em; white-space: pre;">t</span></span></span></span></span></span><span class="mjx-mo MJXc-space3" id="MJXc-Node-389" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.094em; white-space: pre;">=</span></span><span class="mjx-mn MJXc-space3" id="MJXc-Node-390" style="box-sizing: content-box !important; display: inline-block; margin-left: 0.278em;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.37em; padding-top: 0.37em; white-space: pre;">45</span></span><span class="mjx-mo" id="MJXc-Node-391" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-main-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-main-R, MJXc-TeX-main-Rw; padding-bottom: 0.324em; padding-top: 0.416em; white-space: pre;">°</span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; box-sizing: border-box; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mrow><mi>�</mi><mi>�</mi><mi>�</mi></mrow><mo>^</mo></mover><mo>=</mo><mn>55</mn><mo>°</mo><mo>;</mo><mover><mrow><mi>�</mi><mtext>O</mtext><mi>�</mi></mrow><mo>^</mo></mover><mo>=</mo><mn>85</mn><mo>°</mo><mo>;</mo><mover><mrow><mi>�</mi><mtext>O</mtext><mi>�</mi></mrow><mo>^</mo></mover><mo>=</mo><mn>45</mn><mo>°</mo></math></span></span></p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;">a) Chứng tỏ rằng tia On nằm giữa hai tia Om và Ot.</p><p style="box-sizing: border-box; font-family: "Open Sans", Arial, sans-serif; font-size: 18px; line-height: 24px; margin: 0px 0.2em 1em; overflow-wrap: break-word; padding: 0px; text-align: justify;">b) Chứng tỏ rằng tia On là tia phân giác của góc <span class="mjx-chtml MathJax_CHTML" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mrow><mi>m</mi><mi>O</mi><mi>t</mi></mrow><mo>^</mo></mover></math>" id="MathJax-Element-37-Frame" role="presentation" style="border: 0px; box-sizing: border-box; direction: ltr; display: inline-block; float: none; font-size: 21.78px; line-height: 0; margin: 0px; max-height: none; max-width: none; min-height: 0px; min-width: 0px; overflow-wrap: normal; padding: 1px 0px; position: relative; text-align: left; white-space: nowrap; word-spacing: normal;" tabindex="0"><span aria-hidden="true" class="mjx-math" id="MJXc-Node-392" style="border-collapse: separate; border-spacing: 0px; box-sizing: border-box; display: inline-block;"><span class="mjx-mrow" id="MJXc-Node-393" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mover" id="MJXc-Node-394" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-stack" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-over" style="box-sizing: content-box !important; display: block; height: 0.334em; padding-bottom: 0.06em; padding-left: 0.056em;"><span class="mjx-mo" id="MJXc-Node-399" style="box-sizing: content-box !important; display: inline-block; padding-left: 0px !important; padding-right: 0px !important; vertical-align: top;"><span class="mjx-char MJXc-TeX-size4-R" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-size4-R, MJXc-TeX-size4-Rw; padding-bottom: 0.232em; padding-top: 0.645em; white-space: pre;">ˆ</span></span></span><span class="mjx-op" style="box-sizing: content-box !important; display: block;"><span class="mjx-mrow" id="MJXc-Node-395" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-mi" id="MJXc-Node-396" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-top: 0.232em; white-space: pre;">m</span></span><span class="mjx-mi" id="MJXc-Node-397" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-top: 0.461em; white-space: pre;">O</span></span><span class="mjx-mi" id="MJXc-Node-398" style="box-sizing: content-box !important; display: inline-block;"><span class="mjx-char MJXc-TeX-math-I" style="box-sizing: content-box !important; display: block; font-family: MJXc-TeX-math-I, MJXc-TeX-math-Ix, MJXc-TeX-math-Iw; padding-bottom: 0.278em; padding-top: 0.416em; white-space: pre;">t</span></span></span></span></span></span></span></span><span class="MJX_Assistive_MathML" role="presentation" style="border: 0px !important; box-sizing: border-box; clip: rect(1px, 1px, 1px, 1px); display: block !important; height: 1px !important; left: 0px; overflow: hidden !important; padding: 1px 0px 0px !important; position: absolute !important; top: 0px; user-select: none; width: 1px !important;"><math xmlns="http://www.w3.org/1998/Math/MathML"><mover><mrow><mi>�</mi><mi>�</mi><mi>�</mi></mrow><mo>^</mo></mover></math></span></span>.</p>

Công thức về tính chất tia phân giác

  1. Công thức Tia nằm giữa hai cạnh của một góc và tạo với hai cạnh ấy hai góc bằng nhau được gọi là tia phân giác của góc đó. Khi Oz là ti...

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